DOCSLIB.ORG

PUBLIC OPEN EVENING Outreach — 22 November 2017 — A

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
PUBLIC OPEN EVENING Outreach — 22 November 2017 — A Institute of Astronomy PUBLIC OPEN EVENING outreach — 22 November 2017 — A Astronomers see clash of ‘titan’ TONIGHT’S SPEAKER galaxies – 13 billion years ago The talk schedule for this term can be viewed at: this term can be viewed talk schedule for The Ricardo Chavez The Dark Universe Our weekly welcome ELCOME to our weekly Wpublic open evenings for the 2017/18 season. Each night there will be a half-hour talk which begins promptly at 7.15pm: tonight A pair of exceptionally rare hyper-luminous galaxies. The background image is from ESA’s Ricardo Chavez will be telling us Herschel Space Observatory, the middle is from ESO’s Atacama Pathfinder EXperiment (APEX) about The Dark Universe. telescope and on the right is the ALMA image, clearly showing the two starbursting galaxies. The talk is followed by an Credit: NRAO/AUI/NSF,B. Saxton; ESA Herschel; ESO APEX; ALMA(ESO/NAOJ/NRAO); D. Riechers opportunity to observe if (and www.ast.cam.ac.uk/public/public_observing/current only if…) the weather is clear. NEW observations with the Ataca- and greater sensitivity of ALMA that The Cambridge Astronomical ma Large Millimeter/submillimeter astronomers could measure the Association will provide a floorshow Array (ALMA) have discovered a close precise distance to the object and see outdoors on the Observatory lawns, encounter between two astounding- that it was in fact two distinct galaxies. relaying live images from modern ly bright and spectacularly massive The pairing of two otherwise phenom- telescopes with a commentary. The galaxies in the early universe. These enally rare galaxies suggests that they IoA’s historical Northumberland so-called hyper-luminous starburst existed in a particularly dense region and Thorrowgood telescopes galaxies are exceedingly rare at this ep- of the universe during that period in will be open for unaided eye och of cosmic history – near the time its history. when galaxies first formed – and may The new observations also indi- observations, along with the 16-inch represent one of the most-extreme cate that the ADFS-27 system has telescope. If we’re unlucky and it’s examples of violent star formation approximately 50 times the amount cloudy, we’ll offer you a cup of tea ever observed. of star-forming gas as the Milky Way. as compensation after the talk, The two interacting galaxies, collec- Much of this gas will be rapidly con- with perhaps some more astro- tively known as ADFS-27, are located verted into new stars, at rates about information in the lecture theatre for approximately 12.7 billion light-years one thousand times faster than in our those who want to stay on. from Earth; so we are viewing the sys- home galaxy. tem as it appeared when the universe The two galaxies are about 30,000 If you have any questions, suggestions was only about one billion years old. light-years apart, and moving at The galaxies were first detected roughly several hundred kilometres or comments about the IoA Open with the Herschel Space Observatory, per second relative to each other. Evenings please contact Carolin Crawford but appeared just as a single dot that Over the next few hundred million at [email protected] or Matt Bothwell the telescope could not resolve. Fol- years they will eventually slow and fall at [email protected]. We tweet low-up observations confirmed that toward the other, merging into one current astro-news and events as ADFS-27 was in fact both extremely massive elliptical galaxy after several @cambridge_astro bright and extremely distant. But it more close encounters. was only with the higher resolution www.ast.cam.ac.uk/public 2 — IOA PUBLIC OPEN EVENING — 22 November 2017 Closest temperate world orbiting Hitomi reveals quiet star discovered X-ray landscape temperatures between -60 and +20°C thanks to the cool and faint nature of the small red dwarf star, which has just over half the surface temperature of the Sun. Uncertainty remains as to whether the planet lies within the star’s habitable zone, where liquid water may exist on a planet’s surface. Credit: RobertCredit: Lupton/SDSS/NASA Red dwarfs are some of the coolest, faintest – and most common – stars The Perseus galaxy cluster overlaid with a in the universe. They are thus prime part of the Hitomi spectrum. targets in the search for exoplanets. BEFORE its brief mission ended unex- However, many such red dwarf stars, pectedly in March 2016, Japan’s Hitomi including Proxima Centauri (the clos- Artist’s impression of Ross 128 b, with its red X-ray observatory captured exceptional est star to the solar system), produce dwarf parent star in the background. information about the motions of hot violent flares that occasionally bathe Credit: ESO/M. Kornmesser gas in the Perseus galaxy cluster. their orbiting planets in deadly ultra- The Perseus cluster, located 240 A temperate Earth-sized planet has violet and X-ray radiation. However, it million light-years away, is the brightest been discovered only 11 light-years seems that Ross 128 is a much quieter galaxy cluster in X-rays and among the from the solar system orbiting around star, and so its planets may be the most massive near Earth. Thousands of a quiet red dwarf star. closest known comfortable abode for galaxies bound together by gravity orbit Scientists working with the High Ac- possible life. within a thin hot gas. This gas is at a curacy Radial velocity Planet Searcher Although it is currently 11 light- temperature of 50 million °C and is the (HARPS) at the La Silla Observatory years from Earth, Ross 128 is moving source of the cluster’s X-ray emission. in Chile have found that the red dwarf towards us and is expected to become The researchers obtained a spec- star Ross 128 is orbited by an Earth- our nearest stellar neighbour in just trum of unprecedented detail, which sized exoplanet (called Ross 128 b) 79,000 years – a blink of the eye in cos- revealed a landscape of X-ray peaks every 9.9 days. Even though it is 20 mic terms. Ross 128 b will by then take emitted from various chemical ele- times closer to its host than the Earth the crown from Proxima b and become ments with 30 times better resolution is to the Sun, it is expected to have the closest exoplanet to Earth! than any previous data. The propor- tions of elements found in the cluster are nearly identical to those in the Sun Britain’s new Unst is the northernmost Unst of the inhabited British – an unexpected result, given that the space port? Perseus cluster is an environment with Isles and a potential site Shetland Islands a very different history from our Sun’s. Unst, the most northern island in the for a spaceport. Shetlands with a population of only 600, has been identified by the UK Joke of the Week Space Agency as the best site in the UK A spiral galaxy walked into a bar for a drink. for a spaceport to launch satellites into The bartender threw him out and said orbit around Earth. Inverness Aberdeen “You’re barred!” The proposals are at an early stage, but the Shetland Space Centre Ltd has already been set up on the island, a Edinburgh breathtaking fragment nearer Norway Glasgow than it is to Edinburgh. A report suggested that rockets launched from Saxa Vord on Unst Credit: [email protected] could carry the greatest payloads into sites which would have to perform commercially valuable orbits with the avoidance manoeuvres, limiting the lowest risk to inhabitants should the weight of the payload they could carry. spacecraft launch fail. Unst is so far north that rockets could lift off straight into orbit without passing over pop- The potential key site for satellite launches ulated areas, unlike those from other on Unst. Credit: Getty Images.
Load more

Recommended publications
  • Modeling Super-Earth Atmospheres in Preparation for Upcoming Extremely Large Telescopes
    Modeling Super-Earth Atmospheres In Preparation for Upcoming Extremely Large Telescopes Maggie Thompson1 Jonathan Fortney1, Andy Skemer1, Tyler Robinson2, Theodora Karalidi1, Steph Sallum1 1University of California, Santa Cruz, CA; 2Northern Arizona University, Flagstaff, AZ ExoPAG 19 January 6, 2019 Seattle, Washington Image Credit: NASA Ames/JPL-Caltech/T. Pyle Roadmap Research Goals & Current Atmosphere Modeling Selecting Super-Earths for State of Super-Earth Tool (Past & Present) Follow-Up Observations Detection Preliminary Assessment of Future Observatories for Conclusions & Upcoming Instruments’ Super-Earths Future Work Capabilities for Super-Earths M. Thompson — ExoPAG 19 01/06/19 Research Goals • Extend previous modeling tool to simulate super-Earth planet atmospheres around M, K and G stars • Apply modified code to explore the parameter space of actual and synthetic super-Earths to select most suitable set of confirmed exoplanets for follow-up observations with JWST and next-generation ground-based telescopes • Inform the design of advanced instruments such as the Planetary Systems Imager (PSI), a proposed second-generation instrument for TMT/GMT M. Thompson — ExoPAG 19 01/06/19 Current State of Super-Earth Detections (1) Neptune Mass Range of Interest Earth Data from NASA Exoplanet Archive M. Thompson — ExoPAG 19 01/06/19 Current State of Super-Earth Detections (2) A Approximate Habitable Zone Host Star Spectral Type F G K M Data from NASA Exoplanet Archive M. Thompson — ExoPAG 19 01/06/19 Atmosphere Modeling Tool Evolution of Atmosphere Model • Solar System Planets & Moons ~ 1980’s (e.g., McKay et al. 1989) • Brown Dwarfs ~ 2000’s (e.g., Burrows et al. 2001) • Hot Jupiters & Other Giant Exoplanets ~ 2000’s (e.g., Fortney et al.
    [Show full text]
  • NASA Exoplanet Exploration the Search for Habitable Worlds and for Life Beyond the Solar System
    The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 Show Me the Planets! NASA Exoplanet Exploration The Search for Habitable Worlds and for Life Beyond the Solar System Dr. Gary H. Blackwood Manager, NASA Exoplanet Exploration Program Jet Propulsion Laboratory, California Institute of Technology December 12, 2017 Aerospace and Defense Forum, San Fernando Chapter, Sherman Oaks, CA CL#18-1463 © 2017 All rights reserved Artist concept of Kepler-16b What is an Exoplanet? Exoplanet – a planet that orbits another star Credit: Paramount 1 1 The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 NASA Centers and Facilities 2 KEY SCIENCE THEMES Discovering the Secrets of the Universe Searching for Life Elsewhere Safeguarding and Improving Life on Earth 3 2 The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 4 SEARCHING FOR LIFE ELSEWHERE MSL Curiosity 5 3 The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 SEARCHING FOR LIFE ELSEWHERE Vera Rubin Ridge 6 SEARCHING FOR LIFE ELSEWHERE Cassini Grand finale 7 4 The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 Exoplanet Exploration Credit: PHL@UPR, Arecibo, ESA/Hubble, NASA “All These Worlds are Yours…” - Arthur C. Clarke, 2010: Odyssey Two 8 Credit: SETI Institute 9 5 The Aerospace & Defense Forum San Fernando Valley Chapter December 12, 2017 NASA Exoplanet Exploration Program Astrophysics Division, NASA Science Mission Directorate NASA’s search for habitable planets and life beyond our solar system Program purpose described in 2014 NASA Science Plan 1. Discover planets around other stars 2. Characterize their properties 3.
    [Show full text]
  • Impact of Stellar Superflares on Planetary Habitability 3 Exoplanets (Atri 2017)
    Draft version June 20, 2019 Typeset using LATEX preprint style in AASTeX62 Impact of Stellar Superflares on Planetary Habitability Yosuke A. Yamashiki,1, 2 Hiroyuki Maehara,3, 4 Vladimir Airapetian,5, 6 Yuta Notsu,7, 8, 9 Tatsuhiko Sato,10 Shota Notsu,11, 9 Ryusuke Kuroki,1 Keiya Murashima,12 Hiroaki Sato,13 Kosuke Namekata,9 Takanori Sasaki,9, 2 Thomas B. Scott,14 Hina Bando,12 Subaru Nashimoto,12 Fuka Takagi,15 Cassandra Ling,1 Daisaku Nogami,9, 2 and Kazunari Shibata16, 2 1Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University, Sakyo, Kyoto, Japan 2Unit of the Synergetic Studies for Space, Kyoto University, Sakyo, Kyoto, Japan 3Okayama Branch Office, Subaru Telescope, National Astronomical Observatory of Japan, NINS, Kamogata, Asakuchi, Okayama, Japan 4Okayama Observatory, Kyoto University, Kamogata, Asakuchi, Okayama, Japan 5NASA/GSFC/SEEC, Greenbelt, MD, USA 6American University, DC, USA 7Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA 8National Solar Observatory, Boulder, CO, USA 9Department of Astronomy, Kyoto University, Sakyo, Kyoto, Japan 10Nuclear Science and Engineering Center Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, Japan 11Leiden Observatory, Leiden University, Leiden, The Netherlands 12Faculty of Science, Kyoto University, Sakyo, Kyoto, Japan 13Faculty of Engineering, Kyoto University, Sakyo, Kyoto, Japan 14Interface Analysis Centre, University of Bristol, Bristol, UK 15Faculty of Agriculture, Kyoto University, Sakyo, Kyoto, Japan 16Astronomical Observatory, Kyoto University, Sakyo, Kyoto, Japan (Received 17 April 2019; Revised 26 May 2019; Accepted 16 June 2019) Submitted to ApJ ABSTRACT High-energy radiation caused by exoplanetary space weather events from planet- hosting stars can play a crucial role in conditions promoting or destroying habitability in addition to the conventional factors.
    [Show full text]
  • Erosion of an Exoplanetary Atmosphere Caused by Stellar Winds J
    A&A 630, A52 (2019) https://doi.org/10.1051/0004-6361/201935543 Astronomy & © ESO 2019 Astrophysics Erosion of an exoplanetary atmosphere caused by stellar winds J. M. Rodríguez-Mozos1 and A. Moya2,3 1 University of Granada (UGR), Department of Theoretical Physics and Cosmology, 18071 Granada, Spain 2 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK e-mail: [email protected]; [email protected] 3 Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark Received 26 March 2019 / Accepted 8 August 2019 ABSTRACT Aims. We present a formalism for a first-order estimation of the magnetosphere radius of exoplanets orbiting stars in the range from 0.08 to 1.3 M . With this radius, we estimate the atmospheric surface that is not protected from stellar winds. We have analyzed this unprotected surface for the most extreme environment for exoplanets: GKM-type and very low-mass stars at the two limits of the habitable zone. The estimated unprotected surface makes it possible to define a likelihood for an exoplanet to retain its atmosphere. This function can be incorporated into the new habitability index SEPHI. Methods. Using different formulations in the literature in addition to stellar and exoplanet physical characteristics, we estimated the stellar magnetic induction, the main characteristics of the stellar wind, and the different star-planet interaction regions (sub- and super- Alfvénic, sub- and supersonic). With this information, we can estimate the radius of the exoplanet magnetopause and thus the exoplanet unprotected surface.
    [Show full text]
  • Stellar and Planetary Characterization of the Ross 128 Exoplanetary System from Apogee Spectra
    Draft version June 15, 2018 Typeset using LATEX preprint style in AASTeX61 STELLAR AND PLANETARY CHARACTERIZATION OF THE ROSS 128 EXOPLANETARY SYSTEM FROM APOGEE SPECTRA Diogo Souto,1 Cayman T. Unterborn,2 Verne V. Smith,3 Katia Cunha,1, 4 Johanna Teske,5, 6, 7 Kevin Covey,8 Barbara´ Rojas-Ayala,9 D. A. Garc´ıa-Hernandez,´ 10, 11 Keivan Stassun,12 Keivan G. Stassun,12 Olga Zamora,10, 11 Thomas Masseron,10, 11 J. A. Johnson,13 Steven R. Majewski,14 Henrik Jonsson¨ ,15 Steven Gilhool,16 Cullen Blake,16 and Felipe Santana17 1Observat´orioNacional, Rua General Jos´eCristino, 77, 20921-400 S~aoCrist´ov~ao,Rio de Janeiro, RJ, Brazil 2School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA 3National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA 4Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA 5Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC 20015 6The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena CA, 91101. 7Hubble Fellow 8Department of Physics & Astronomy, Western Washington University, Bellingham, WA, 98225, USA 9Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, Las Condes, Santiago, Chile 10Instituto de Astrof´ısica de Canarias, E-38205 La Laguna, Tenerife, Spain 11Departamento de Astrof´ısica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain 12Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center Ln., Nashville, TN 37235, USA Department of Physics, Fisk University, 1000 17th Ave. N., Nashville, TN 37208, USA 13Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA 14Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA 15Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE-221 00 Lund, Sweden 16Department of Physics and Astronomy, University of Pennsylvania, 209 S.
    [Show full text]
  • Annual Report ESO Staff Papers 2018
    ESO Staff Publications (2018) Peer-reviewed publications by ESO scientists The ESO Library maintains the ESO Telescope Bibliography (telbib) and is responsible for providing paper-based statistics. Publications in refereed journals based on ESO data (2018) can be retrieved through telbib: ESO data papers 2018. Access to the database for the years 1996 to present as well as an overview of publication statistics are available via http://telbib.eso.org and from the "Basic ESO Publication Statistics" document. Papers that use data from non-ESO telescopes or observations obtained with hosted telescopes are not included. The list below includes papers that are (co-)authored by ESO authors, with or without use of ESO data. It is ordered alphabetically by first ESO-affiliated author. Gravity Collaboration, Abuter, R., Amorim, A., Bauböck, M., Shajib, A.J., Treu, T. & Agnello, A., 2018, Improving time- Berger, J.P., Bonnet, H., Brandner, W., Clénet, Y., delay cosmography with spatially resolved kinematics, Coudé Du Foresto, V., de Zeeuw, P.T., et al. , 2018, MNRAS, 473, 210 [ADS] Detection of orbital motions near the last stable circular Treu, T., Agnello, A., Baumer, M.A., Birrer, S., Buckley-Geer, orbit of the massive black hole SgrA*, A&A, 618, L10 E.J., Courbin, F., Kim, Y.J., Lin, H., Marshall, P.J., Nord, [ADS] B., et al. , 2018, The STRong lensing Insights into the Gravity Collaboration, Abuter, R., Amorim, A., Anugu, N., Dark Energy Survey (STRIDES) 2016 follow-up Bauböck, M., Benisty, M., Berger, J.P., Blind, N., campaign - I. Overview and classification of candidates Bonnet, H., Brandner, W., et al.
    [Show full text]
  • Directly Imaging Rocky Planets from the Ground
    Astro2020 Science White Paper Directly Imaging Rocky Planets from the Ground Thematic Areas: ˝3Planetary Systems ˝ Star and Planet Formation ˝ Formation and Evolution of Compact Objects ˝ Cosmology and Fundamental Physics ˝ Stars and Stellar Evolution ˝ Resolved Stellar Populations and their Environments ˝ Galaxy Evolution ˝ Multi-Messenger Astronomy and Astrophysics Principal Author: Name: B. Mazin Institution: University of California Santa Barbara Email: [email protected] Phone: (805)893-3344 Co-authors: (names and institutions) E.´ Artigau, Universite´ de Montreal´ V. Bailey, California Institute of Technology/JPL C. Baranec, University of Hawaii C. Beichman. California Institute of Technology/JPL B. Benneke, Universite´ de Montreal´ J. Birkby, University of Amsterdam T. Brandt, University of California Santa Barbara J. Chilcote, University of Notre Dame M. Chun, University of Hawaii L. Close, University of Arizona T. Currie, NASA-Ames Research Center I. Crossfield, Massachusetts Institute of Technology R. Dekany, California Institute of Technology J.R. Delorme, California Institute of Technology/JPL C. Dong, Princeton University R. Dong, University of Victoria R. Doyon, Universite´ de Montreal´ C. Dressing, University of California Berkeley M. Fitzgerald, University of California Los Angeles J. Fortney, University of California Santa Cruz R. Frazin, University of Michigan E. Gaidos, University of Hawai‘i O. Guyon, University of Arizona/Subaru Telescope J. Hashimoto, Astrobiology Center of NINS L. Hillenbrand, California Institute of Technology A. Howard, California Institute of Technology R. Jensen-Clem, University of California Berkeley N. Jovanovic, California Institute of Technology T. Kotani, Astrobiology Center of NINS H. Kawahara, University of Tokyo Q. Konopacky, University of California San Diego H. Knutson, , California Institute of Technology M.
    [Show full text]
  • 6 Dec 2019 Is Interstellar Travel to an Exoplanet Possible?
    Physics Education Publication Date Is interstellar travel to an exoplanet possible? Tanmay Singal1 and Ashok K. Singal2 1Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai 200433, China. [email protected] 2Astronomy and Astrophysis Division, Physical Research Laboratory Navrangpura, Ahmedabad 380 009, India. [email protected] Submitted on xx-xxx-xxxx Abstract undertake such a voyage, with hopefully a positive outcome? What could be a possible scenario for such an adventure in a near In this article, we examine the possibility of or even distant future? And what could be interstellar travel to reach some exoplanet the reality of UFOs – Unidentified Flying orbiting around a star, beyond our Solar Objects – that get reported in the media system. Such travels have been in the realm from time to time? of science fiction for long. However, in the last 50 years or so, this question has gained further impetus in the mind of a man on the 1 Introduction street, after the interplanetary travel has become a reality. Of course the distances to In the last three decades many thousands of be covered to reach even some of the near- exoplanets, planets that orbit around stars est stars outside the Solar system could be beyond our Solar system, have been dis- arXiv:1308.4869v2 [physics.pop-ph] 6 Dec 2019 hundreds of thousands of time larger than covered. Many of them are in the habit- those encountered within the interplanetary able zone, possibly with some forms of life space. Consequently, the time and energy evolved on a fraction of them, and hope- requirements for such a travel could be fully, the existence of intelligent life on some immensely prohibitive.
    [Show full text]
  • Erosion of an Exoplanetary Atmosphere Caused by Stellar Winds J
    Astronomy & Astrophysics manuscript no. atmosphere_erision ©ESO 2019 August 20, 2019 Erosion of an exoplanetary atmosphere caused by stellar winds J. M. Rodríguez-Mozos1 and A. Moya2; 3 1 University of Granada (UGR). Dept. Theoretical Physics and Cosmology. 18071. Granada. Spain 2 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK 3 Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark e-mail: [email protected] Received September 15, 1996; accepted March 16, 1997 ABSTRACT Aims. We present a formalism for a first-order estimation of the magnetosphere radius of exoplanets orbiting stars in the range from 0.08 to 1.3 M . With this radius, we estimate the atmospheric surface that is not protected from stellar winds. We have analyzed this unprotected surface for the most extreme environment for exoplanets: GKM-type and very low-mass stars at the two limits of the habitable zone. The estimated unprotected surface makes it possible to define a likelihood for an exoplanet to retain its atmosphere. This function can be incorporated into the new habitability index SEPHI. Methods. Using different formulations in the literature in addition to stellar and exoplanet physical characteristics, we estimated the stellar magnetic induction, the main characteristics of the stellar wind, and the different star-planet interaction regions (sub- and super-Alfvénic, sub- and supersonic). With this information, we can estimate the radius of the exoplanet
    [Show full text]
  • Stellar and Substellar Companions of Nearby Stars from Gaia DR2 Pierre Kervella, Frédéric Arenou, François Mignard, Frédéric Thévenin
    Stellar and substellar companions of nearby stars from Gaia DR2 Pierre Kervella, Frédéric Arenou, François Mignard, Frédéric Thévenin To cite this version: Pierre Kervella, Frédéric Arenou, François Mignard, Frédéric Thévenin. Stellar and substellar com- panions of nearby stars from Gaia DR2. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 623, pp.A72. 10.1051/0004-6361/201834371. hal-02064555 HAL Id: hal-02064555 https://hal.archives-ouvertes.fr/hal-02064555 Submitted on 12 Mar 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. A&A 623, A72 (2019) Astronomy https://doi.org/10.1051/0004-6361/201834371 & c P. Kervella et al. 2019 Astrophysics Stellar and substellar companions of nearby stars from Gaia DR2 Binarity from proper motion anomaly? Pierre Kervella1, Frédéric Arenou2, François Mignard3, and Frédéric Thévenin3 1 LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France e-mail: [email protected] 2 GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, 92190 Meudon, France 3 Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Lagrange UMR 7293, CS 34229, 06304 Nice Cedex 4, France Received 3 October 2018 / Accepted 26 January 2019 ABSTRACT Context.
    [Show full text]
  • Fyzikální Chemie Bc. Tereza Kaiserová
    Univerzita Karlova Přírodovědecká fakulta Studijní program: Fyzikální chemie Bc. Tereza Kaiserová Phosphine and nitrous oxide as false-positive biosignature gases in planetary spectra Fosfan a oxid dusný jako falešně pozitivní biosignatury ve spektrech planet Diplomová práce Vedoucí práce: RNDr. Martin Ferus, Ph.D. Praha, 2021 Charles University Faculty of Science Univerzita Karlova Přírodovědecká fakulta Study programme: Physical chemistry Bc. Tereza Kaiserová Phosphine and nitrous oxide as false-positive biosignature gases in planetary spectra Fosfan a oxid dusný jako falešně pozitivní biosignatury ve spektrech planet Diploma thesis Supervisor: RNDr. Martin Ferus, Ph.D. Prague, 2021 Charles University Faculty of Science Prohlášení Prohlašuji, že jsem závěrečnou práci zpracovala samostatně a že jsem uvedla všechny použité informační zdroje a literaturu. Tato práce ani její podstatná část nebyla předložena k získání jiného nebo stejného akademického titulu. V Praze, 16. 06. 2021 Bc. Tereza Kaiserová podpis studenta Tato práce byla podpořena projektem GAČR reg. č. 19-03314S, kontraktem ESA reg. č. PEA4000131855 “Manufacturing and testing of mirrors for the ARIEL satellite mission” a projektem MŠMT - ERDF/ESF “Centrum pokročilých aplikovaných věd” reg. č. CZ.02.1.01/0.0/0.0/16019/0000778. 3 Acknowledgements I would like to use this page to thank all the people who had a positive impact on my life and my work! First of all, I would like to thank my parents for always supporting me, I know you have sacrificed a lot for me to be this happy! I would like to thank my fiancé for always being my rock, for listening to me and for making me happy every time he sees that I need it.
    [Show full text]
  • November 2017
    Space News Update – November 2017 By Pat Williams IN THIS EDITION: • NASA telescope studies quirky comet 45P. • Changes in the brain during extended missions in space. • NASA selects instrument for future international mission to Martian moons. • Orbital ATK set to launch eighth Cargo Resupply Mission to the International Space Station. • Solar minimum surprisingly constant. • Space technology to drive autonomous ships. • Links to other space and astronomy news published in November 2017. Disclaimer - I claim no authorship for the printed material; except where noted (PW). NASA TELESCOPE STUDIES QUIRKY COMET 45P Comet 45P/Honda-Mrkos-Pajdušáková is captured using a telescope from Farm Tivoli in Namibia, Africa. Credits: Gerald Rhemann The comet, officially named 45P/Honda-Mrkos-Pajdušáková, belongs to the Jupiter family of comets, frequent orbiters that loop around the Sun about every five to seven years. Much less is known about native ices in this group than in the long-haul comets from the Oort Cloud. The levels of nine gases released from the icy nucleus into the comet’s thin atmosphere, or coma were studied. Several of these gases supply building blocks for amino acids, sugars and other biologically relevant molecules. Of interest were carbon monoxide and methane, which are so hard to detect in Jupiter-family comets that they’ve only been studied a few times before. The gases all originate from the hodgepodge of ices, rock and dust that make up the nucleus. These native ices are thought to hold clues to the comet’s history and how it has been aging. (NASA Goddard) NASA telescope studies quirky comet 45P (21 November 2017) Page 1 of 18 CHANGES IN THE BRAIN DURING EXTENDED MISSIONS IN SPACE ISS astronaut's brain pre-flight (left) and post flight (right) (courtesy: Medical University of South Carolina) Space is a hostile environment and presents many physiological and psychological challenges.
    [Show full text]