Starspot-induced Optical and Infrared Radial Velocity Variability in T Tauri Star Hubble I 4
Abstract
We report optical (~6150 Å) and K-band (2.3 μm) radial velocities obtained over two years for the pre-main-sequence weak-lined T Tauri star Hubble I 4. We detect periodic and near-sinusoidal radial velocity variations at both wavelengths, with a semi-amplitude of 1395 ± 94 m s^(–1) in the optical and 365 ± 80 m s^(–1) in the infrared. The lower velocity amplitude at the longer wavelength, combined with bisector analysis and spot modeling, indicates that there are large, cool spots on the stellar surface that are causing the radial velocity modulation. The radial velocities maintain phase coherence over hundreds of days suggesting that the starspots are long-lived. This is one of the first active stars where the spot-induced velocity modulation has been resolved in the infrared.
Additional Information
© 2011 The American Astronomical Society. Received 2011 March 7; accepted 2011 May 11; published 2011 July 15. This work was partially supported by NASA Origins Grants 05-SSO05-86 and 07-SSO07-86; we also acknowledge the SIM Young Planets Key Project for research support. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France, and NASA's Astrophysics Data System. The authors wish to thank Wei Chen, Wilson Cauley, and Jennifer Blake-Mahmud for observing assistance at McDonald Observatory. We recognize the significant cultural role that Mauna Kea plays in the Hawaiian community and are grateful for the opportunity to observe there. Facilities: IRTF (CSHELL), Smith (TS23)Attached Files
Published - Mahmud2011p15609Astrophys_J.pdf
Files
Name | Size | Download all |
---|---|---|
md5:5ca65a3ed41ba3253765f233b0cf8a75
|
636.4 kB | Preview Download |
Additional details
- Eprint ID
- 25197
- Resolver ID
- CaltechAUTHORS:20110901-114500385
- 05-SSO05-86
- NASA Origins Grants
- 07-SSO07-86
- NASA Origins Grants
- SIM Young Planets Key Project
- Created
-
2011-09-01Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field