A 40 Myr OLD GASEOUS CIRCUMSTELLAR DISK AT 49 CETI: MASSIVE CO-RICH COMET CLOUDS AT YOUNG A-TYPE STARS
- 27 September 2012
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 758 (2), 77
- https://doi.org/10.1088/0004-637x/758/2/77
Abstract
The gaseous molecular disk that orbits the main-sequence A-type star 49 Ceti has been known since 1995, but the stellar age and the origin of the observed carbon monoxide molecules have been unknown. We now identify 49 Ceti as a member of the 40 Myr old Argus Association and present a colliding comet model to explain the high CO concentrations seen at 49 Ceti and the 30 Myr old A-type star HD 21997. The model suggests that massive—400 Earth mass—analogs of the Sun's Kuiper Belt are in orbit around some A-type stars, that these large masses are composed primarily of comet-like objects, and that these objects are rich in CO and perhaps also CO2. We identify additional early-type members of the Argus Association and the Tucana/Horologium and Columba Associations; some of these stars display excess mid-infrared emission as measured with the Widefield Infrared Survey Explorer.Keywords
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This publication has 40 references indexed in Scilit:
- CONSTRAINING THE PLANETARY SYSTEM OF FOMALHAUT USING HIGH-RESOLUTION ALMA OBSERVATIONSThe Astrophysical Journal Letters, 2012
- Herschelimages of FomalhautAstronomy & Astrophysics, 2012
- NEW PRECISION ORBITS OF BRIGHT DOUBLE-LINED SPECTROSCOPIC BINARIES. III. HD 82191, ω DRACONIS, AND 108 HERCULISThe Astronomical Journal, 2009
- A Resolved Molecular Gas Disk around the Nearby A Star 49 CetiThe Astrophysical Journal, 2008
- Collisional Vaporization of Dust and Production of Gas in the β Pictoris Dust DiskThe Astrophysical Journal, 2007
- Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common systemAstronomy Letters, 2006
- CO emission from discs around isolated HAeBe and Vega-excess starsMonthly Notices of the Royal Astronomical Society, 2005
- A Possible Massive Asteroid Belt around ζ LeporisThe Astrophysical Journal, 2001
- Dust around Main‐Sequence Stars: Nature or Nurture by the Interstellar Medium?The Astrophysical Journal, 1997
- A survey for circumstellar disks around young stellar objectsThe Astronomical Journal, 1990