A search for substellar companions around nine weak-lined T-Tauri stars with the Planetary Camera 2 of the Hubble Space Telescope

Details A search for substellar companions around nine weak-lined T-Tauri stars with the Planetary Camera 2 of the Hubble Space Telescope A search for substellar companions around nine weak-lined T-Tauri stars with the Planetary Camera 2 of the Hubble Space Telescope

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334..592s&link_type=abstract

Astronomy and Astrophysics, v.334, p.592-598 (1998)

Astronomy and Astrophysics

Astrophysics

11

Stars: Pre-Main Sequence, Stars: Imaging, Stars: Low-Mass, Brown Dwarfs, Planetary Systems

Scientific paper

To search for substellar companions, we have obtained I-band images of 9 weak-lined T-Tauri stars in the Taurus-Auriga star-forming region using the Planetary Camera 2 of the Hubble Space Telescope. Except for a stellar companion close to HBC 407, we found no companions within 8arcsec of any of our targets. We did find 23 faint objects outside a separation of 8arcsec . For 12 of these, we have color information that implies they are background objects. Our sensitivity limit for companions separated by more than 1arcsec is better than Delta I = 10 mag. This limit degrades to Delta I = 5 mag at a separation of about 0.2arcsec . For the median apparent magnitude, I = 11 mag, and median age, 10(7) yr, of our targets, the above sensitivity limits correspond to companions with 18 and 55 Jupiter masses, respectively. To complement the imaging program, radial-velocity observations of the 9 stars were obtained using the Center for Astrophysics Digital Speedometers. There is a hint of a long-term acceleration of about 2 km s(-1) over ten years in the radial velocity of HBC 407, consistent with the evidence for a close companion to HBC 407 found in the HST images. In addition, one of our targets, HBC 392 was found to be a double-lined spectroscopic binary. Some of the observations reported here were obtained with the Multiple Mirror Telescope, a joint facility of the Smithsonian Institution and the University of Arizona

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