JOUR^IAL of the Escail,IBA AMATE a R AS TRO T{ O ME R's AS S O C ATI O N

Total Page:16

File Type:pdf, Size:1020Kb

JOUR^IAL of the Escail,IBA AMATE a R AS TRO T{ O ME R's AS S O C ATI O N JOUR^IAL of the ESCAil,IBA AMATE A R AS TRO T{ O ME R'S AS S O C ATI O N VOLUME WV Number 4-5 April-May 2000 ,Ftt*{.*{.{.{r****{<{r*****!t ******* +**(* rF + *+:1.:t {. r.,1.4.{<*{.{(**'f {.**{.{.{s{<*:F{.*{.******{.*{.{.{<****:1.** Editor and ALCOR: Dr. J. Wayne Wooten, Physical Sciences, Room 9704, Pensacola J.C., Pensacola FL 32504. Phone (850) 484-1152 (voicemail), (E-mail) wwooten @pjc.cc.fl.us Editorial Staff: Bert Black (85Q a76-alA5; Jacque Falzone (850) 438-2045 President - Ed Mogowan (850) 458-a577; V-P - Andy Walker (850) 469-1774 Secretary - Mike Davey (850) 939-5279; Treasurer Jim Larduskey (850) 434-3638 Librarian - Elaine smith (jj$ 961-2686; Observing - Warren Jarvis (850) 623-8061 Publicity - Margret Hildreth (850) 457-8656; PJC DL webpage www.distance.pjc.cc.lLus Please mail all dues to E/AA,4660 Shannon Circle, Pensacola, FL 32504. ***************************************************************** A NOTE OF APOLOGY When it was decided at the Astronomy Day celebration on April 8e that we should move back the April 21$meeting on Good Friday to ttre 28t, and also participate in the Earth Day activities at Swille Square on April LTnd,Ihad hoped to get the Meteor out in time to alert you to these changes. However, my WebCT training course at PJC took most of my time the next weelg and so I had to call or e-mail many of you, and alert the rest over the Bulletin Bgard on our website. If you did not get the word in time, my apologies. -Wayte Wooten, Editor ASTRONOMY DAY AT PJC Astronomy Day April 8, 2000 celebration was held at Pensacola Junior College. A literature table and astrophotography display board were set up in the lobby of the Space and Science Theater by 10:00 a.m. Our astronomical art contest on the lobby walls featured work from Donna Governor's classes in "Historical Motifs" at Brown Barge Middle School. The winner of the 8x21 monoculars was Katie Devereau, and the second place constellation puzzle went to Jeffrey Yee, with Jennifer McCombs winning the third place prize; the 15x50 telesmpe went to Mrs. Govemor for promoting the contest for her students, since we had no winner in the senior high division. The EAAA library/classroom was open with miniature models of the Solm System and a globe of the Earth. Moon rocks and meteorites from NASA's Kennedy SFC were on display in the Interactive classroom. The Star Trek Continuum Chapter and the local chapter of KAG (Klingon Assault Group) put on presentations of their planetary real estate (see pages 3-4) during the day. Many thanks to John Humphries, Nancy KeitlL Jay Gallops, and Kate Moss for their fine presentations on the 35 newly found worlds. We were saddened by news of the resignation of our Science and Space theatre staff, Director Clint Hatchett, and SYSOP Joyce Divina, but Michael Wooten presented four different planetarium shows in the planetarium during the afternoon and evening; we appreciate Clint's help in setting up the programs. Telescopes were set up on the south side of the theater. Dry ice, water, ammoni4 and dirt were used to simulate miniature comet material by Dave Halupowski. Sunspots were viewed using solar filters on the telescopes. The crescent Moon was viewedthrough telescopes about noontime. Venus and Jupiter were viewed through with the telescopes in the afternoon. As the skies darkened in the evening the Moon, Saturn, Mars, Jupiter and deep sky objects were viewed; the resolution with our new video cameras was astounding, even with the objects so low in the west THE METEOR VOLUME nff Number 4-5 Apfl-*Iay 2000 Page 2 The attendanc€ was stea$ throughout the day and wening, with about 300 total affendees. The weather was windy all day but the temperature was mild. ln late aftemoon the wind and drop in outside temperature made the theater a welcome refuge. Members remained outside sharing the Moon and planets with the public until about 9:30 PM. We did manage to split Sirius with the C-8 and the Astrovid camera at about 300X. The following EAAA members were present: Margaret Hildreth, Elaine Smittt, Jacque Falzong Wayne and Michael Wooten, Jim Larduskey, Jerry Kobi, Bert Black, Mike Davey and son, Tom Dragon and family, Skip McAninch and wifg Joe and Nichole Pagano, Dave Halupowski and daughter, Frank Palma, Walter Behrens and family, Louis Pcheny, Andy Walker, Warren Jawis, Ed Magowan, and Dewey Barker. -Bert Black Minules of the March EA3 Meeting The meeting began at 7: 1 0 PM with 40 members and guests present. Guests included Michael Silver, Bill Langford and son Bruce, Josh Ward and Patrick Henderson. Jim Larduskey reported 81,279.34 in savings and $433.57 in checking. It was noted one of our members, Bob Hill, suffered a heart attack and is home recovering. You can send him your best wishes for a speedy recovery either by mail at 6220 Bradshaw Rd. Pensacola 32526,by calling his house at 455-8801, or online at his e-mail address which is [email protected]. The Baader Solar Folters are in, and by first reports are much better than X'Ray film or Mylar for looking at the sun with.. Draco has sizes to fit small refractors and reflectors and catadioptric telescopes along with binoculars. For larger aperatures there are offaxis sizes available. Joe Pagano received his level I award. Certificates were handed out to members Bert Black and Steve Henderson for their services as former club officers. The popular Iridium satellites appeff to be coming down due to financial bankruptcy by the LLC Corporation. The Heavens-Above website linked from the club's homepage still has predictions listed though for how long we don't know. Astronomy Day is fast approaching. There are plans for children's prizes for the Student's Art Contest telescope building demonstrations, mete,orites and moomocks, solar observing outside along with live video inside, and something new this year: presentations by two local sci-fi clubs, the Klingons and Star Trek Club will be doing presentations. The Kaiser Farm stargaze went moderatd okay, though the cows and tall grass plus humidity put a hamper on conditions. The same night as the Kaiser gaze, about 15 members showed up at the Munson Site. Member Jacque Falzone has a site which is next on the list to be tried for out of town stargazes for Pensacola residences. The hanian Astronomy Club has received the donations sent by our club. Member Jacque Falzone donated The Handy Space Answer Book to the club. The meeting adjourned at7'.55 for a short r@ess, after which members watched an episode about life on other worlds from the "Universe:Infinite Frontier" series. -Mihe Davey, Secretary Bushnell Vayager 100X4.5" Rwiew With the Nature Company in Cordova Mall closed, we can turn across the street to Ritz Camera for Meade and Bushnell telescopes. Former F.AI{A member John Stallworth aranged with his manager for us to borrow the'oBlue BaIl" Bushnell copy of the popular Edmund Astroscan. It sells for only $199, or about half the oost of the red scopg but has many of the same features. It is reviewed by Glem Chaple in the article "Deja' Blue" on page76 of the May 2000 issue of Astronomy magazine. To Glenn's comments, I would add the following notes, based on about a week of using the scope with my UWF, PJC, and F.AJM gtroups. The 100X is not realistic. The 5mm SR eyepiece is of poor qualrty and narrow field of view, and Bushnell is ill advised to include it. But the 27mm Plossl does give a fme view at 17X. I made a 2" offset Baader solar filter for it, and the sunspot detail was striking with bright faculae visible even around spots near the center of the disk. I think the Draco 10.5mm (about 47x) would be a good eyepiece for medium power, and just avoid the highest magnifications. .the fast f/4.4 focal ratio is not really designed for it, Also, the felt pads did not offer enough friction to stop the scope from slipping at low elevations; I addpd tape. Still, the price is great, it is a snap to set up and use, and the low powo, tich field views should be wonderful. -Wayne Wooten Federation WorLds ln 1494, the Spanish and Portuguese decided to split up the rmexplored wmld between them, with Spain getting the new world (sans Brazil) and Putugal took Africa and the Orient (sans the Philippines). Of course later Britain, France, and the Dutdr would have something to say about this. In a like vein, we are splitting up the 35 known planets to date among our United Federation (Star Trek) and Klingon Empires here in Pensacola, and will have each group describe some of the ge,ms in their empire. The Federation worlds lie between 0-12 hours RA, and the Klingon ones from 12-24 hours RA. Remember that these are real worlds, discovered since 1995. All so far are much bigger than Earth, but some might have Earth-sized inhabitable moons orbiting them. These new planets and their stms lie between 0-12 horns RA, in the hemisphere of space designated for exploration by the Star Trek folks. Here are some of their assigned assets; flip the page and you will see the Klingons got the best deal, at least for the mornent (but remember that new planets are being found at the rate of one per month lately): 17 Ursu Majofis is a slightly hotter Suil (G09, lyng 46 light years distant in the Big Dipper.
Recommended publications
  • Lurking in the Shadows: Wide-Separation Gas Giants As Tracers of Planet Formation
    Lurking in the Shadows: Wide-Separation Gas Giants as Tracers of Planet Formation Thesis by Marta Levesque Bryan In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy CALIFORNIA INSTITUTE OF TECHNOLOGY Pasadena, California 2018 Defended May 1, 2018 ii © 2018 Marta Levesque Bryan ORCID: [0000-0002-6076-5967] All rights reserved iii ACKNOWLEDGEMENTS First and foremost I would like to thank Heather Knutson, who I had the great privilege of working with as my thesis advisor. Her encouragement, guidance, and perspective helped me navigate many a challenging problem, and my conversations with her were a consistent source of positivity and learning throughout my time at Caltech. I leave graduate school a better scientist and person for having her as a role model. Heather fostered a wonderfully positive and supportive environment for her students, giving us the space to explore and grow - I could not have asked for a better advisor or research experience. I would also like to thank Konstantin Batygin for enthusiastic and illuminating discussions that always left me more excited to explore the result at hand. Thank you as well to Dimitri Mawet for providing both expertise and contagious optimism for some of my latest direct imaging endeavors. Thank you to the rest of my thesis committee, namely Geoff Blake, Evan Kirby, and Chuck Steidel for their support, helpful conversations, and insightful questions. I am grateful to have had the opportunity to collaborate with Brendan Bowler. His talk at Caltech my second year of graduate school introduced me to an unexpected population of massive wide-separation planetary-mass companions, and lead to a long-running collaboration from which several of my thesis projects were born.
    [Show full text]
  • Naming the Extrasolar Planets
    Naming the extrasolar planets W. Lyra Max Planck Institute for Astronomy, K¨onigstuhl 17, 69177, Heidelberg, Germany [email protected] Abstract and OGLE-TR-182 b, which does not help educators convey the message that these planets are quite similar to Jupiter. Extrasolar planets are not named and are referred to only In stark contrast, the sentence“planet Apollo is a gas giant by their assigned scientific designation. The reason given like Jupiter” is heavily - yet invisibly - coated with Coper- by the IAU to not name the planets is that it is consid- nicanism. ered impractical as planets are expected to be common. I One reason given by the IAU for not considering naming advance some reasons as to why this logic is flawed, and sug- the extrasolar planets is that it is a task deemed impractical. gest names for the 403 extrasolar planet candidates known One source is quoted as having said “if planets are found to as of Oct 2009. The names follow a scheme of association occur very frequently in the Universe, a system of individual with the constellation that the host star pertains to, and names for planets might well rapidly be found equally im- therefore are mostly drawn from Roman-Greek mythology. practicable as it is for stars, as planet discoveries progress.” Other mythologies may also be used given that a suitable 1. This leads to a second argument. It is indeed impractical association is established. to name all stars. But some stars are named nonetheless. In fact, all other classes of astronomical bodies are named.
    [Show full text]
  • Arxiv:2105.11583V2 [Astro-Ph.EP] 2 Jul 2021 Keck-HIRES, APF-Levy, and Lick-Hamilton Spectrographs
    Draft version July 6, 2021 Typeset using LATEX twocolumn style in AASTeX63 The California Legacy Survey I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades Lee J. Rosenthal,1 Benjamin J. Fulton,1, 2 Lea A. Hirsch,3 Howard T. Isaacson,4 Andrew W. Howard,1 Cayla M. Dedrick,5, 6 Ilya A. Sherstyuk,1 Sarah C. Blunt,1, 7 Erik A. Petigura,8 Heather A. Knutson,9 Aida Behmard,9, 7 Ashley Chontos,10, 7 Justin R. Crepp,11 Ian J. M. Crossfield,12 Paul A. Dalba,13, 14 Debra A. Fischer,15 Gregory W. Henry,16 Stephen R. Kane,13 Molly Kosiarek,17, 7 Geoffrey W. Marcy,1, 7 Ryan A. Rubenzahl,1, 7 Lauren M. Weiss,10 and Jason T. Wright18, 19, 20 1Cahill Center for Astronomy & Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA 2IPAC-NASA Exoplanet Science Institute, Pasadena, CA 91125, USA 3Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA 4Department of Astronomy, University of California Berkeley, Berkeley, CA 94720, USA 5Cahill Center for Astronomy & Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA 6Department of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA 7NSF Graduate Research Fellow 8Department of Physics & Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA 9Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA 10Institute for Astronomy, University of Hawai`i,
    [Show full text]
  • Kein Folientitel
    The Doppler Method, or the Radial Velocity Detection of Planets: II. Results Telescope Instrument Wavelength Reference 1-m MJUO Hercules Th-Ar / Iodine cell 1.2-m Euler Telescope CORALIE Th-Ar 1.8-m BOAO BOES Iodine Cell 1.88-m Okayama Obs, HIDES Iodine Cell 1.88-m OHP SOPHIE Th-Ar 2-m TLS Coude Echelle Iodine Cell 2.2m ESO/MPI La Silla FEROS Th-Ar 2.7m McDonald Obs. 2dcoude Iodine cell 3-m Lick Observatory Hamilton Echelle Iodine cell 3.8-m TNG SARG Iodine Cell 3.9-m AAT UCLES Iodine cell 3.6-m ESO La Silla HARPS Th-Ar 8.2-m Subaru Telescope HDS Iodine Cell 8.2-m VLT UVES Iodine cell 9-m Hobby-Eberly HRS Iodine cell 10-m Keck HiRes Iodine cell Campbell & Walker: The Pioneers of RV Planet Searches 1988: 1980-1992 searched for planets around 26 solar-type stars. Even though they found evidence for planets, they were not 100% convinced. If they had looked at 100 stars they certainly would have found convincing evidence for exoplanets. Campbell, Walker, & Yang 1988 „Probable third body variation of 25 m s–1, 2.7 year period, superposed on a large velocity gradient“ The first (?) extrasolar planet around a normal star: HD 114762 with M sin i = 11 MJ discovered by Latham et al. (1989) Filled circles are data taken at McDonald Observatory using the telluric lines at 6300 Ang. The mass was uncomfortably high (remember sin i effect) to regard it unambiguously as an extrasolar planet The Search For Extrasolar Planets At McDonald Observatory Bill Cochran & Artie Hatzes Hobby-Eberly 9 m Telescope Harlan J.
    [Show full text]
  • Interstellarum 25 Schließen Wir Den Ersten Jahrgang Der Neuen Interstellarum-Hefte Ab
    Liebe Leserinnen, liebe Leser, Meade gegen Celestron, das ist das große Duell der beiden Teleskopgiganten aus Amerika. Wir sind stolz darauf, als erste deutschsprachige Zeitschrift einen fairen Zweikampf der weltgröß- ten Fernrohrhersteller anbieten zu können; un- getrübt von wirtschaftlichen oder redaktionellen Vorbehalten. Dazu haben wir die neuen aufre- genden GPS-Teleskope von Meade und Celes- tron in einem Produktvergleich gegenüberge- stellt. Im ersten Teil in diesem Heft erfahren Sie mehr über Mechanik und Elektronik der beiden Computerteleskope (Seite 60); die Ergebnisse der Praxis unter den Sternen lesen Sie dann in einem kommenden Heft. Mit interstellarum 25 schließen wir den ersten Jahrgang der neuen interstellarum-Hefte ab. Ein Plus von 30% bei den Abonnentenzahlen spricht für unseren Weg, den wir konsequent fortsetzen Polarlichter in Deutschland (Foto: Thomas Jäger) werden. Dabei möchten wir verstärkt das Augen- merk auf hochqualitative Beiträge für praktisch tätige Amateurastronomen lenken. werden wir uns zusätzlich der Jupiterbeobach- tung und dem Merkurdurchgang vom 7.5.2003 2003 wird bei interstellarum zum Jahr der widmen. Schließlich stehen 2003 mit zwei Planetenbeobachtung ernannt. Auftakt ist der Mondfinsternissen und einer partiellen Sonnen- Beitrag zur Beobachtung der Saturnringe in die- finsternis drei weitere Großereignisse auf dem ser Ausgabe (Seite 34). Mit dem nächsten Heft Programm. beginnen wir zusätzlich eine intensive Vorberei- tung auf die große Mars-Opposition in diesem Was wir noch 2003 geplant haben, ist auf Sommer mit Beiträgen zu verschiedenen prakti- www.interstellarum.de nachzulesen. Ihren eige- schen Themenkreisen in jedem Heft. Verstärkt nen Bericht nehmen wir gerne entgegen. Mit interstellarum 25 endet die Comic-Serie Astromax (Seite 80), die Schöpfer Rainer Töpler aus Zeitgründen aufgeben muss – vielen Dank für die sechs kurzweiligen Geschichtchen.
    [Show full text]
  • Milan Dimitrijevic Avgust.Qxd
    1. M. Platiša, M. Popović, M. Dimitrijević, N. Konjević: 1975, Z. Fur Natur- forsch. 30a, 212 [A 1].* 1. Griem, H. R.: 1975, Stark Broadening, Adv. Atom. Molec. Phys. 11, 331. 2. Platiša, M., Popović, M. V., Konjević, N.: 1975, Stark broadening of O II and O III lines, Astron. Astrophys. 45, 325. 3. Konjević, N., Wiese, W. L.: 1976, Experimental Stark widths and shifts for non-hydrogenic spectral lines of ionized atoms, J. Phys. Chem. Ref. Data 5, 259. 4. Hey, J. D.: 1977, On the Stark broadening of isolated lines of F (II) and Cl (III) by plasmas, JQSRT 18, 649. 5. Hey, J. D.: 1977, Estimates of Stark broadening of some Ar III and Ar IV lines, JQSRT 17, 729. 6. Hey, J. D.: Breger, P.: 1980, Stark broadening of isolated lines emitted by singly - ionized tin, JQSRT 23, 311. 7. Hey, J. D.: Breger, P.: 1981, Stark broadening of isolated ion lines by plas- mas: Application of theory, in Spectral Line Shapes I, ed. B. Wende, W. de Gruyter, 201. 8. Сыркин, М. И.: 1981, Расчеты электронного уширения спектральных линий в теории оптических свойств плазмы, Опт. Спектроск. 51, 778. 9. Wiese, W. L., Konjević, N.: 1982, Regularities and similarities in plasma broadened spectral line widths (Stark widths), JQSRT 28, 185. 10. Konjević, N., Pittman, T. P.: 1986, Stark broadening of spectral lines of ho- mologous, doubly ionized inert gases, JQSRT 35, 473. 11. Konjević, N., Pittman, T. P.: 1987, Stark broadening of spectral lines of ho- mologous, doubly - ionized inert gases, JQSRT 37, 311. 12. Бабин, С.
    [Show full text]
  • Planets and Exoplanets
    NASE Publications Planets and exoplanets Planets and exoplanets Rosa M. Ros, Hans Deeg International Astronomical Union, Technical University of Catalonia (Spain), Instituto de Astrofísica de Canarias and University of La Laguna (Spain) Summary This workshop provides a series of activities to compare the many observed properties (such as size, distances, orbital speeds and escape velocities) of the planets in our Solar System. Each section provides context to various planetary data tables by providing demonstrations or calculations to contrast the properties of the planets, giving the students a concrete sense for what the data mean. At present, several methods are used to find exoplanets, more or less indirectly. It has been possible to detect nearly 4000 planets, and about 500 systems with multiple planets. Objetives - Understand what the numerical values in the Solar Sytem summary data table mean. - Understand the main characteristics of extrasolar planetary systems by comparing their properties to the orbital system of Jupiter and its Galilean satellites. The Solar System By creating scale models of the Solar System, the students will compare the different planetary parameters. To perform these activities, we will use the data in Table 1. Planets Diameter (km) Distance to Sun (km) Sun 1 392 000 Mercury 4 878 57.9 106 Venus 12 180 108.3 106 Earth 12 756 149.7 106 Marte 6 760 228.1 106 Jupiter 142 800 778.7 106 Saturn 120 000 1 430.1 106 Uranus 50 000 2 876.5 106 Neptune 49 000 4 506.6 106 Table 1: Data of the Solar System bodies In all cases, the main goal of the model is to make the data understandable.
    [Show full text]
  • Application on Behalf of Cornwall Council and Caradon Observatory for Bodmin Moor to Be Considered As an International Dark Sky Landscape
    1 Executive Summary Bodmin Moor is a special place. Amongst the many environmental designations ranging from the international to the local, Bodmin Moor forms part of an Area of Outstanding Beauty. This means it benefits from the same planning status and protection as English National Parks. Visitors are already drawn to the dramatic panoramas, varied wildlife and intriguing history, with those already in the know also appreciating and learning about the stars in the exceptionally dark night sky. Caradon Observatory readings taken in and around Bodmin Moor quantify the remarkable quality of the sky’s darkness and correspond with the findings of the Campaign to Protect Rural England Night Blight study. The results show that even around the villages there are impressive views of the night sky. There is considerable support from the public and stakeholder organisations for the establishment of Bodmin Moor as an International Dark Sky Landscape with “Park” status. Feedback from residents, businesses, landowners, farmers, astronomers, educators, environmental bodies and other statutory and charitable organisations has helped shape the proposals. Enthusiasm is such that there have already been calls to widen the buffer zone if the designation is successful. The alternative title for the designation stems from local feedback and reflects the AONB status. Bodmin Moor comprises a varied moorland landscape with a few small villages and hamlets so there is very little artificial light. Nevertheless, steps have been taken and are continuing to be made to reduce light pollution, particularly from streets. This means that the vast majority of lighting is sensitive to the dark night sky and is becoming even more sympathetic.
    [Show full text]
  • On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach
    Atoms 2014, 2, 357-377; doi:10.3390/atoms2030357 OPEN ACCESS atoms ISSN 2218-2004 www.mdpi.com/journal/atoms Article On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach Milan S. Dimitrijević 1,2,* and Sylvie Sahal-Bréchot 2 1 Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia 2 Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique, Observatoire de Paris, UMR CNRS 8112, UPMC, 5 Place Jules Janssen, 92195 Meudon Cedex, France; E-Mail: [email protected] (S.S.-B.) * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +381-64-297-8021; Fax: +381-11-2419-553. Received: 5 May 2014; in revised form: 20 June 2014 / Accepted: 16 July 2014 / Published: 7 August 2014 Abstract: The significance of Stark broadening data for problems in astrophysics, physics, as well as for technological plasmas is discussed and applications of Stark broadening parameters calculated using a semiclassical perturbation method are analyzed. Keywords: Stark broadening; isolated lines; impact approximation 1. Introduction Stark broadening parameters of neutral atom and ion lines are of interest for a number of problems in astrophysical, laboratory, laser produced, fusion or technological plasma investigations. Especially the development of space astronomy has enabled the collection of a huge amount of spectroscopic data of all kinds of celestial objects within various spectral ranges. Consequently, the atomic data for trace elements, which had not been
    [Show full text]
  • Extrasolar Planets in Stellar Multiple Systems
    Astronomy & Astrophysics manuscript no. exoplanets˙binaries˙final˙rn © ESO 2012 April 24, 2012 Extrasolar planets in stellar multiple systems T. Roell1, R. Neuh¨auser1, A. Seifahrt1,2,3, and M. Mugrauer1 1 Astrophysical Institute and University Observatory Jena, Schillerg¨aßchen 2, 07745 Jena, Germany e-mail: [email protected] 2 Physics Department, University of California, Davis, CA 95616, USA 3 Department of Astronomy and Astrophysics, University of Chicago, IL 60637, USA Received ...; accepted ... ABSTRACT Aims. Analyzing exoplanets detected by radial velocity (RV) or transit observations, we determine the multiplicity of exoplanet host stars in order to study the influence of a stellar companion on the properties of planet candidates. Methods. Matching the host stars of exoplanet candidates detected by radial velocity or transit observations with online multiplicity catalogs in addition to a literature search, 57 exoplanet host stars are identified having a stellar companion. Results. The resulting multiplicity rate of at least 12 % for exoplanet host stars is about four times smaller than the multiplicity of solar like stars in general. The mass and the number of planets in stellar multiple systems depend on the separation between their host star and its nearest stellar companion, e.g. the planetary mass decreases with an increasing stellar separation. We present an updated overview of exoplanet candidates in stellar multiple systems, including 15 new systems (compared to the latest summary from 2009). Key words. extrasolar planets – stellar multiple systems – planet formation 1. Introduction in Mugrauer & Neuh¨auser (2009), these studies found 44 stel- lar companions around stars previously not known to be mul- More than 700 extrasolar planet (exoplanet) candidates were dis- tiple, which results in a multiplicity rate of about 17 %, while covered so far (Schneider et al.
    [Show full text]
  • WTS-1 B: the first Extrasolar Planet Detected in the WFCAM Transit Survey
    WTS-1 b: the first extrasolar planet detected in the WFCAM Transit Survey Michele Cappetta M¨unchen2012 WTS-1 b: the first extrasolar planet detected in the WFCAM Transit Survey Michele Cappetta Dissertation an der Fakult¨atf¨urPhysik der Ludwig{Maximilians{Universit¨at M¨unchen vorgelegt von Michele Cappetta aus Bolzano, Italien M¨unchen, den 19. Dezember 2012 Erstgutachter: R. P. Saglia Zweitgutachter: B. Ercolano Tag der m¨undlichen Pr¨ufung:5. Februar 2013 Contents Zusammenfassung xix Summary xxi 1 Extrasolar planets 1 1.1 Introduction . .2 1.2 Detection methods . .4 1.3 Planet formation . .7 1.3.1 The Solar Nebular Model . .7 1.3.2 Rocky planets formation . .8 1.3.3 Gas-giant planets formation . 10 1.4 Planet evolution . 13 1.4.1 Gas disk migration . 13 1.4.2 Planetesimal-driven migration . 14 1.4.3 Planet-planet scattering . 16 1.5 Extrasolar planets properties . 17 1.5.1 Radius anomaly of the hot-Jupiters . 22 2 WFCAM Transit Survey 25 2.1 Observing strategy . 27 2.2 Reduction pipeline . 29 2.3 Transit detection algorithm . 32 2.4 Transit recovery ratios . 34 2.5 Results . 37 3 Instrumentation and spectroscopic observations 39 3.1 Hobby-Eberly Telescope . 40 3.2 The HRS Spectrograph . 42 3.3 Instrumental configurations . 46 3.4 Visit types . 49 4 Reduction and analysis pipeline 51 4.1 Introduction . 52 vi CONTENTS 4.2 Data reduction . 54 4.2.1 Cosmic-rays filtering . 54 4.2.2 Frames calibration . 54 4.2.3 Apertures definition . 55 4.2.4 Spectra extraction .
    [Show full text]
  • Stability of Planetary Orbits in Binary Systems
    A&A 434, 355–364 (2005) Astronomy DOI: 10.1051/0004-6361:20040238 & c ESO 2005 Astrophysics Stability of planetary orbits in binary systems Z. E. Musielak1,2, M. Cuntz2,1, E. A. Marshall2, and T. D. Stuit3 1 Institut für Theoretische Astrophysik, Universität Heidelberg, Albert Überle Straße 2, 69120 Heidelberg, Germany 2 Department of Physics, University of Texas at Arlington, Arlington, TX 76019-0059, USA e-mail: [zmusielak;cuntz;emarshall]@uta.edu 3 Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899, USA Received 10 February 2004 / Accepted 23 December 2004 Abstract. Stability of S-type and P-type planetary orbits in binary systems of different mass and separation ratios is inves- tigated. Criteria for stable, marginally stable and unstable planetary orbits are specified. These criteria are used to determine regions of stability of planetary orbits in different binary systems with Jupiter-type planets. The obtained results show that the regions of stability for S-type orbits depend on the distance ratio between the star and planet, and the stellar companions, in the range of 0.22 and 0.46, depending on the mass ratio. For P-type orbits, the regions of stability also depend on that distance ratio, in the range of 1.75 and 2.45, again depending on the the mass ratio. Applications of these results to three observed binary systems with giant planets, namely, τ Boo, HD 195019 and GJ 86, show that the orbits of the giant planets in those systems can be classified as stable, as expected.
    [Show full text]