Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster

Details Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster

2007-05-31

arxiv.org/abs/0705.4601v1

Mon.Not.Roy.Astron.Soc.379:1658-1664,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 9 pages

Scientific paper

10.1111/j.1365-2966.2007.12049.x

Disks in the 6 Myr old cluster eta Chamaeleontis were searched for emission from hot H2. Around the M3 star ECHAJ0843.3-7905 we detect circumstellar gas orbiting at ~2 AU. If the gas is UV-excited, the ro-vibrational line traces a hot gas layer supported by a disk of mass ~0.03Msolar, similar to the minimum mass solar nebula. Such a gas reservoir at 6 Myr would promote the formation and inwards migration of gas giant planets.

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