Misaligned Protoplanetary Disks in a Young Binary System
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I. Deep Search for N2H+ in the Protoplanetary Disks Around Lkca
A&A 464, 615–623 (2007) Astronomy DOI: 10.1051/0004-6361:20065385 & c ESO 2007 Astrophysics Chemistry in disks + I. Deep search for N2H in the protoplanetary disks around LkCa 15, MWC 480, and DM Tauri A. Dutrey1, T. Henning2, S. Guilloteau1,D.Semenov2,V.Piétu3,K.Schreyer4, A. Bacmann1, R. Launhardt2, J. Pety3,andF.Gueth3 1 L3AB, Observatoire de Bordeaux, 2 rue de l’Observatoire, BP 89, 33270 Floirac, France e-mail: [email protected] 2 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany 3 IRAM, 300 rue de la Piscine, 38406 Saint-Martin-d’Hères, France 4 Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergässchen 2-3, 07745 Jena, Germany Received 7 April 2006 / Accepted 21 November 2006 ABSTRACT Aims. To constrain the ionization fraction in protoplanetary disks, we present new high-sensitivity interferometric observations + of N2H in three disks surrounding DM Tau, LkCa 15, and MWC 480. + 2 Methods. We used the IRAM PdBI array to observe the N2H J = 1−0 line and applied a χ -minimization technique to estimate corresponding column densities. These values are compared, together with HCO+ column densities, to results of a steady-state disk model with a vertical temperature gradient coupled to gas-grain chemistry. + Results. We report two N2H detections for LkCa 15 and DM Tau at the 5σ level and an upper limit for MWC 480. The column den- + + sity derived from the data for LkCa 15 is much lower than previously reported. The [N2H /HCO ] ratio is on the order of 0.02−0.03. -
Hot Gas Lines in T Tauri Stars
Smith ScholarWorks Astronomy: Faculty Publications Astronomy 7-2013 Hot Gas Lines in T Tauri Stars David R. Ardila California Institute of Technology Gregory J. Herczeg Peking University Scott G. Gregory California Institute of Technology Laura Ingleby University of Michigan Kevin France University of Colorado, Boulder See next page for additional authors Follow this and additional works at: https://scholarworks.smith.edu/ast_facpubs Part of the Astrophysics and Astronomy Commons Recommended Citation Ardila, David R.; Herczeg, Gregory J.; Gregory, Scott G.; Ingleby, Laura; France, Kevin; Brown, Alexander; Edwards, Suzan; Johns-Krull, Christopher; Linsky, Jeffrey L.; Yang, Hao; Valenti, Jeff A.; Abgrall, Hervé; Alexander, Richard D.; Bergin, Edwin; Bethell, Thomas; Brown, Joanna M.; Calvet, Nuria; Espaillat, Catherine; Hillenbrand, Lynne A.; Hussain, Gaitee; Roueff, Evelyne; Schindhelm, Eric R.; and Walter, Frederick M., "Hot Gas Lines in T Tauri Stars" (2013). Astronomy: Faculty Publications, Smith College, Northampton, MA. https://scholarworks.smith.edu/ast_facpubs/23 This Article has been accepted for inclusion in Astronomy: Faculty Publications by an authorized administrator of Smith ScholarWorks. For more information, please contact [email protected] Authors David R. Ardila, Gregory J. Herczeg, Scott G. Gregory, Laura Ingleby, Kevin France, Alexander Brown, Suzan Edwards, Christopher Johns-Krull, Jeffrey L. Linsky, Hao Yang, Jeff A. Valenti, Hervé Abgrall, Richard D. Alexander, Edwin Bergin, Thomas Bethell, Joanna M. Brown, Nuria Calvet, Catherine Espaillat, Lynne A. Hillenbrand, Gaitee Hussain, Evelyne Roueff, Eric R. Schindhelm, and Frederick M. Walter This article is available at Smith ScholarWorks: https://scholarworks.smith.edu/ast_facpubs/23 The Astrophysical Journal Supplement Series, 207:1 (43pp), 2013 July doi:10.1088/0067-0049/207/1/1 C 2013. -
THE YOUNG ASTRONOMERS NEWSLETTER Volume 23 Number 6 STUDY + LEARN = POWER May 2015
THE YOUNG ASTRONOMERS NEWSLETTER Volume 23 Number 6 STUDY + LEARN = POWER May 2015 ****************************************************************************************************************************** AUSTRALIAN CRATER HIDDEN STARS A team of geophysicists has found the twin scars of Scientists found a bright nebula around the Milky the impacts of a huge meteorite that broke in two Way”s nearby star 48 Librae in a patch of sky that moments before it slammed into the Earth millions of appears totally black in visible light but appears in infra- years ago in central Australia. It is the largest impact red. They said: "This cluster is probably a group of very zone ever found on Earth – 400 kilometers wide. young stars forming inside a previously undiscovered “YELLOW BALLS” molecular cloud, and the 48 Librae nebula apparently is Citizen scientists recently found a new class of due to a huge cloud of dust around the star.” curiosities that had gone unrecognized before: yellow HUBBLE IS 25! balls. Many "citizen scientist" projects make up the Hubble, the first telescope to revolutionize modern Zooniverse website which relies on “crowd-sourcing” to astronomy and change our view of the universe by help process scientific data. offering glimpses of distant galaxies, has marked its 25th The rounded features are not actually yellow but year in space. A senior scientist said: "Hubble absolutely appear that way in the infrared images the telescope has changed the way humans look at the universe and sends to Earth. See: http://www.spxdaily.com/images- our place in it." lg/yellow-balls-process-star-formation-lg.jpg A DISTANT PLANET and http://www.zooniverse.org The Spitzer Space Telescope teamed up with CANADA’S NEW TMT TELESCOPE Poland’s OGLE telescope in Chile to find a remote gas Canada and an international partnership are funding planet about 13,000 light-years away, making it one of the construction of the Thirty Meter Telescope - the top the most distant planets known. -
INAUGURAL – DISSERTATION Dipl.-Phys. Alexander A. Schegerer
INAUGURAL – DISSERTATION zur Erlangung der Doktorwurde¨ der Naturwissenschaftlich-Mathematischen Gesamtfakult¨at der Ruprecht - Karls - Universit¨at Heidelberg vorgelegt von Dipl.-Phys. Alexander A. Schegerer, geboren in Kaufbeuren Tag der mundlichen¨ Prufung:¨ 17. Oktober 2007 II Struktur- und Staubentwicklung in zirkumstellaren Scheiben um T Tauri-Sterne Analyse und Modellierung hochaufl¨osender Beobachtungen in verschiedenen Wellenl¨angenbereichen Gutachter: Prof. Dr. Thomas Henning Prof. Dr. Wolfgang Duschl IV Meinen Eltern, Maria-Christa und Wolfgang Schegerer, gewidmet. VI Thema Im Zentrum dieser Doktorarbeit steht die Untersuchung der inneren Strukturen zirkumstella- rer Scheiben um T Tauri-Sterne sowie die Analyse zirkumstellarer Staub- und Eisteilchen und ihres Einflusses auf die Scheibenstruktur. Unter Zuhilfenahme von theoretisch berechneten Vergleichsspektren gibt der Verlauf der 10 µm-Emissionsbande in den Spektren junger stellarer Objekte Hinweise auf den Entwick- lungsgrad von Silikatstaub. Die Silikatbanden von 27 T Tauri-Objekten werden analysiert, um nach potentiell vorliegenden Korrelationen zwischen der Silikatstaubzusammensetzung und den stellaren Eigenschaften zu suchen. Analog erlaubt das Absorptionsband bei 3 µm, das dem Wassereis zugeschrieben wird, eine Untersuchung der Entwicklung von Eisk¨ornern in jungen stellaren Objekten. Erstmals ist es gelungen, kristallines Wassereis im Spektrum eines T Tauri-Objektes nachzuweisen. Unser wichtigstes Hilfsmittel zur Analyse der Temperatur- und Dichtestrukturen zirkum- stellarer -
Arxiv:0805.2293V1 [Astro-Ph] 15 May 2008 Iemaueet F(U)Ilmtreiso Rmc (Aft CO from Emission H (Sub)Millimeter of Sens Complementary, Measurements 2001)
Astronomy & Astrophysics manuscript no. 9742ms c ESO 2008 May 16, 2008 Molecules in the Circumstellar Disk Orbiting BP Piscium Research Note Joel H. Kastner1,2, B. Zuckerman3,4, and Thierry Forveille1 1 Laboratoire d’Astrophysique de Grenoble, Universit´eJoseph Fourier — CNRS, BP 53, 38041 Grenoble Cedex, France e-mail: [email protected] 2 Chester F. Carlson Center for Imaging Science, Rochester Institute of Technology, 54 Lomb Memorial Dr., Rochester, NY 14623 USA 3 Dept. of Physics & Astronomy, University of California, Los Angeles 90095 USA 4 UCLA Center for Astrobiology, University of California, Los Angeles 90095 USA Received ...; accepted ... ABSTRACT Context. BP Psc is a puzzling late-type, emission-line field star with large infrared excess. The star is encircled and enshrouded by a nearly edge-on, dusty circumstellar disk, and displays an extensive jet system similar to those associated with pre-main sequence (pre-MS) stars. However, the photospheric absorption features of the star itself appear more consistent with post-main sequence status. Aims. We seek to characterize the molecular gas component of the BP Psc disk, so as to compare the properties of its molecular disk with those of well-studied pre-main sequence stars. Methods. We conducted a mm-wave molecular line survey of BP Psc with the 30 m telescope of the Institut de Radio Astronomie Millimetrique (IRAM). We use these data to investigate the kinematics, gas mass, and chemical constituents of the BP Psc disk. 12 13 + Results. We detected lines of CO and CO and, possibly, very weak emission from HCO and CN; HCN, H2CO, and SiO are not detected. -
Chemical-Composition-Of-The-Circumstellar-Disk-Around-AB-Aurigae.Pdf (1.034Mb)
Astronomy & Astrophysics manuscript no. AB_Aur_final c ESO 2015 May 12, 2015 Chemical composition of the circumstellar disk around AB Aurigae S. Pacheco-Vázquez1 , A. Fuente1, M. Agúndez2, C. Pinte6, 7, T. Alonso-Albi1, R. Neri3, J. Cernicharo2,J. R. Goicoechea2, O. Berné4, 5, L. Wiesenfeld6, R. Bachiller1, and B. Lefloch6 1 Observatorio Astronómico Nacional (OAN), Apdo 112, E-28803 Alcalá de Henares, Madrid, Spain e-mail: [email protected], [email protected] 2 Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, C/ Sor Juana Inés de la Cruz 3, E-28049 Cantoblanco, Spain e-mail: [email protected] 3 Institut de Radioastronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d’Hères, France 4 Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 5 CNRS, IRAP, 9 Av. colonel Roche, BP 44346, F-31028 Toulouse cedex 4, France 6 Institut de Planétologie et d’Astrophysique de Grenoble (IPAG) UMR 5274, Université UJF-Grenoble 1/CNRS-INSU, F-38041 Grenoble, France 7 UMI-FCA, CNRS/INSU, France (UMI 3386), and Dept. de Astronomía, Universidad de Chile, Santiago, Chile e-mail: [email protected] Received September 15, 1996; accepted March 16, 1997 ABSTRACT Aims. Our goal is to determine the molecular composition of the circumstellar disk around AB Aurigae (hereafter, AB Aur). AB Aur is a prototypical Herbig Ae star and the understanding of its disk chemistry is paramount for understanding the chemical evolution of the gas in warm disks. Methods. We used the IRAM 30-m telescope to perform a sensitive search for molecular lines in AB Aur as part of the IRAM Large program ASAI (A Chemical Survey of Sun-like Star-forming Regions). -
Ring Structure in the MWC 480 Disk Revealed by ALMA? Yao Liu1,2, Giovanni Dipierro3, Enrico Ragusa4, Giuseppe Lodato4, Gregory J
A&A 622, A75 (2019) Astronomy https://doi.org/10.1051/0004-6361/201834157 & © ESO 2019 Astrophysics Ring structure in the MWC 480 disk revealed by ALMA? Yao Liu1,2, Giovanni Dipierro3, Enrico Ragusa4, Giuseppe Lodato4, Gregory J. Herczeg5, Feng Long5, Daniel Harsono6, Yann Boehler7,8, Francois Menard8, Doug Johnstone9,10, Ilaria Pascucci11,12, Paola Pinilla13, Colette Salyk14, Gerrit van der Plas8, Sylvie Cabrit8,15, William J. Fischer16, Nathan Hendler11, Carlo F. Manara17, Brunella Nisini18, Elisabetta Rigliaco19, Henning Avenhaus1, Andrea Banzatti11, and Michael Gully-Santiago20 1 Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany 2 Purple Mountain Observatory & Key Laboratory for Radio Astronomy, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, PR China e-mail: [email protected] 3 Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK 4 Dipartimento di Fisica, Universita` Degli Studi di Milano, Via Celoria, 16, Milano, 20133, Italy 5 Kavli Institute for Astronomy and Astrophysics, Peking University, Yiheyuan 5, Haidian Qu, 100871 Beijing, PR China 6 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands 7 Rice University, Department of Physics and Astronomy, Main Street, 77005 Houston, USA 8 Université Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France 9 NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada 10 Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada -
The Architecture of the Lkca 15 Transitional Disk Revealed by High-Contrast Imaging
UvA-DARE (Digital Academic Repository) The architecture of the LkCa 15 transitional disk revealed by high-contrast imaging Thalmann, C.; Mulders, G.D.; Hodapp, K.; Janson, M.; Grady, C.A.; Min, M.; de Juan Ovelar, M.; Carson, J.; Brandt, T.; Bonnefoy, M.; McElwain, M.W.; Leisenring, J.; Dominik, C.; Henning, T.; Tamura, M. DOI 10.1051/0004-6361/201322915 Publication date 2014 Document Version Final published version Published in Astronomy & Astrophysics Link to publication Citation for published version (APA): Thalmann, C., Mulders, G. D., Hodapp, K., Janson, M., Grady, C. A., Min, M., de Juan Ovelar, M., Carson, J., Brandt, T., Bonnefoy, M., McElwain, M. W., Leisenring, J., Dominik, C., Henning, T., & Tamura, M. (2014). The architecture of the LkCa 15 transitional disk revealed by high-contrast imaging. Astronomy & Astrophysics, 566, A51. https://doi.org/10.1051/0004- 6361/201322915 General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. -
Observing Dust Grain Growth and Sedimentation in Circumstellar Discs Interpretations and Predictions of Their Observable Quantities in a Multi-Wavelength Approach
Observing dust grain growth and sedimentation in circumstellar discs Interpretations and predictions of their observable quantities in a multi-wavelength approach Dissertation zur Erlangung des Doktorgrades der Mathematisch-Naturwissenschaftliche Fakult¨at der Christian-Albrechts Universit¨atzu Kiel vorgelegt von J¨urgenSauter Kiel, 2011 Referent : Prof. Dr. S. Wolf Koreferent: Prof. Dr. C. Dullemond Tag der m¨undlichen Pr¨ufung: 7. Juli 2011 Zum Druck genehmigt: 7. Juli 2011 gez. Prof. Dr. L. Kipp, Dekan To my growing family Abstract In the present thesis, the observational effects of dust grain growth and sedimentation in circumstellar discs are investigated. The growth of dust grains from some nanometres in diameter as found in the inter- stellar medium towards planetesimal bodies some meters in diameter is an important step in the formation of planets. However, this process is currently not entirely un- derstood. Especially, in the literature several `barriers' are discussed that apparently prohibit an effective growth of dust grains. Hence, it is of particular interest to compare theories and observational data in this respect. State-of-the-art radiative transfer techniques allow one to derive observable quantities from theoretical models that allow this comparison. In this thesis, generic tracers of dust grain growth in spatially high resolution multi-wavelength images are identified for the first time. Further, a possibility to detect a dust trapping mechanism for dust grains by local pressure maxima using the new interferometer, ALMA, is established. By fitting parametric models to new observations of the disc in the Bok globule CB 26, unexpected features of the system are revealed, such as a large inner void and the possibility to interpret the data without the need for grain growth. -
Optical Spectroscopy of Embedded Young Stars in the Taurus-Auriga Molecular Cloud
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server Optical Spectroscopy of Embedded Young Stars in the Taurus-Auriga Molecular Cloud Scott J. Kenyon Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 e-mail: [email protected] David I. Brown Jet Propulsion Laboratory, MS 156-205, 4800 Oak Grove Drive, Pasadena, CA 91109 e-mail: [email protected] Christopher A. Tout Institute of Astronomy, Madingley Road, Cambridge CB3 0HA England e-mail: [email protected] and Perry Berlind Whipple Observatory, PO Box 97, Amado, AZ 85645 e-mail: [email protected] to appear in The Astronomical Journal June 1998 –2– ABSTRACT This paper describes the first optical spectroscopic survey of class I sources (also known as embedded sources and protostars) in the Taurus-Auriga dark cloud. We detect 10 of the 24 known class I sources in the cloud at 5500–9000 A.˚ All detected class I sources have strong Hα emission; most also have strong [O I] and [S II] emission. These data – together with high quality optical spectra of T Tauri stars in the Taurus-Auriga cloud – demonstrate that forbidden emission lines are stronger and more common in class I sources than in T Tauri stars. Our results also provide a clear discriminant in the frequency of forbidden line emission between weak-emission and classical T Tauri stars. In addition to strong emission lines, three class I sources have prominent TiO absorption bands. The M-type central stars of these sources mingle with optically visible T Tauri stars in the HR diagram and lie somewhat below both the birthline for spherical accretion and the deuterium burning sequence for disc accretion. -
GERSON DE OLIVEIRA BARBOSA Formação Planetária Em Sistemas
GERSON DE OLIVEIRA BARBOSA Formação Planetária em Sistemas Binários Guaratinguetá - SP 2016 Gerson de Oliveira Barbosa Formação Planetária em Sistemas Binários Trabalho de Graduação apresentado ao Conselho de Curso de Graduação em Licenciatura em Matemática da Faculdade de Engenharia do Campus de Guaratinguetá, Universidade Estadual Paulista, como parte dos requisitos para obtenção do diploma de Graduação em Licenciatura em Matemática. Orientador: Othon Cabo Winter Coorientador: Rita de Cássia Domingos Guaratinguetá - SP 2016 Barbosa, Gerson de Oliveira Formação planetária em sistemas binários / Gerson de Oliveira B238f Barbosa – Guaratinguetá, 2017. 63f. : il. Bibliografia: f. 61-63 Trabalho de Graduação em Licenciatura em Matemática – Universidade Estadual Paulista, Faculdade de Engenharia de Guaratinguetá, 2017. Orientador: Prof. Dr. Othon Cabo Winter Coorientadora: Rita de Cássia Domingos 1. Exoplanetas. 2. Planetas. 3. Sistema binário (Matemática). 4. Sistema solar. I. Título CDU 523.4 DADOS CURRICULARES NOME COMPLETO DO AUTOR NASCIMENTO 17.08.1987 – Guaratinguetá / SP FILIAÇÃO Geraldo Cotta Barbosa Janaína Fabrício de Oliveira Barbosa 2013/2016 Graduado em Licenciatura em Matemática Universidade Estadual Paulista “Júlio Mesquita Filho” - FEG dedico este trabalho de modo especial, à minha família. AGRADECIMENTOS Agradeço a todos que estiveram comigo nessa jornada e que de alguma forma contribuíram para minha formação. Em especial: Aos meus pais Geraldo Cotta Barbosa e Janaína Fabrício de Oliveira Barbosa, que me ensinaram as principais coisas da vida e confiaram cegamente no meu sucesso. Não sei dizer o quanto tenho orgulho de ser filho de vocês, obrigado meus velhos! Ao meu orientador, Prof. Dr. Othon Cabo Winter que me inspira, motiva e orgulha. Fez- me conhecer a coisa que mais gosto de fazer e sempre ocupou a posição de maior estima e referência. -
X-Ray Emission of Multiple T Tauri Stars in Taurus
A&A 369, 971–980 (2001) Astronomy DOI: 10.1051/0004-6361:20010173 & c ESO 2001 Astrophysics X-ray emission of multiple T Tauri stars in Taurus B. K¨onig1, R. Neuh¨auser1;2, and B. Stelzer1 1 MPI f¨ur extraterrestrische Physik, Giessenbachstraße 1, 85740 Garching, Germany 2 Institute for Astronomy, University of Hawaii, Honolulu, USA Received 29 February 2000 / Accepted 26 January 2001 Abstract. We present a study of X-ray emission of known multiple T Tauri stars (TTS) in Taurus based on ROSAT observations. We used the ROSAT All-Sky Survey (RASS) detection rates of single classical (cTTS) and weak-line TTS (wTTS) to investigate statistically the TTS nature (classical or weak-line) of the components in multiple TTS, which are too close for spatially resolved spectroscopy so far. Because single wTTS show a higher RASS detection rate than single cTTS, the different binary TTS (cTTS-cTTS, cTTS-wTTS, wTTS-wTTS) should also have different detection rates. We find that the observed RASS detection rates of binary wTTS, where the nature of the secondary is unknown, are in agreement with the secondaries being wTTS rather than cTTS, and mixed pairs are very rare. Furthermore we analyse the X-ray emission of TTS systems resolvable by the ROSAT HRI. Among those systems we find statistical evidence that primaries show larger X-ray luminosity than secondaries, and that the samples of primary and secondary TTS are similar concerning the X-ray over bolometric luminosity ratios. Furthermore, primaries always emit harder X-rays than secondaries. In all cases where rotational velocities and/or periods are known for both companions, it is always the primary that rotates faster.