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http://hdl.handle.net/20.500.12386/29652
Titolo: | Hunting for Planets in the HL Tau Disk | Autori: | TESTI, Leonardo Skemer, A. Henning, Th. Bailey, V. Defrère, D. Hinz, Ph. Leisenring, J. Vaz, A. ESPOSITO, Simone FONTANA, Adriano Marconi, Alessandro Skrutskie, M. Veillet, C. |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 812 | Fascicolo: | 2 | Da pagina:: | L38 | Abstract: | Recent ALMA images of HL Tau show gaps in the dusty disk that may be caused by planetary bodies. Given the young age of this system, if confirmed, this finding would imply very short timescales for planet formation, probably in a gravitationally unstable disk. To test this scenario, we searched for young planets by means of direct imaging in the L′ band using the Large Binocular Telescope Interferometer mid-infrared camera. At the location of two prominent dips in the dust distribution at ̃70 AU (̃0.″5) from the central star, we reach a contrast level of ̃7.5 mag. We did not detect any point sources at the location of the rings. Using evolutionary models we derive upper limits of ̃10-15 M<SUB>Jup</SUB> at ≤0.5-1 Ma for the possible planets. With these sensitivity limits we should have been able to detect companions sufficiently massive to open full gaps in the disk. The structures detected at millimeter wavelengths could be gaps in the distributions of large grains on the disk midplane caused by planets not massive enough to fully open the gaps. Future ALMA observations of the molecular gas density profile and kinematics as well as higher contrast infrared observations may be able to provide a definitive answer. | Acknowledgments: | We thank the LBT Observatory director and staff for the flexibility in scheduling this project and for supporting the observations. This publication makes use of data products from the Wide-field Infrared Survey Explorer , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota, and University of Virginia. A.S. is supported by the National Aeronautics and Space Administration through Hubble Fellowship grant HSTHF2-51349 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. Development of the LEECH high-contrast imaging pipeline is funded by the NASA Origins of Solar Systems Program, grant NNX13AJ17G. The Large Binocular Telescope Interferometer is funded by the National Aeronautics and Space Administration as part of its Exoplanet Exploration program. LMIRcam is funded by the National Science Foundation through grant NSF AST-0705296. This work was partly supported by the Italian Ministero dell’Istruzione, Università e Ricerca through the grant Progetti Premiali 2012—iALMA (CUP C52I13000140001). | URI: | http://hdl.handle.net/20.500.12386/29652 | URL: | https://iopscience.iop.org/article/10.1088/2041-8205/812/2/L38 | ISSN: | 2041-8205 | DOI: | 10.1088/2041-8205/812/2/L38 | Bibcode ADS: | 2015ApJ...812L..38T | Fulltext: | open |
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