SIMBAD references

2000A&A...354L...9N - Astronomy and Astrophysics, volume 354, L9-12 (2000/2-1)

On the possibility of ground-based direct imaging detection of extra-solar planets: the case of TWA-7.

NEUHAEUSER R., BRANDNER W., ECKART A., GUENTHER E., ALVES J., OTT T., HUELAMO N. and FERNANDEZ M.

Abstract (from CDS):

We show that ground-based direct imaging detection of extra-solar planets is possible with current technology. As an example, we present evidence for a possible planetary companion to the young T Tauri star 1RXS J104230.3-334014 (=TWA-7), discovered by ROSAT as a member of the nearby TW Hya association. In an HST NICMOS F160W image, an object is detected that is more than 9 mag fainter than TWA-7, located 2.445±0.035'' south-east at a position angle of 142.24±1.34°. One year later using the ESO-NTT with the SHARP speckle camera, we obtained H- and K-band detections of this faint object at a separation of 2.536±0.077" and a position angle of 139.3±2.1°. Given the known proper motion of TWA-7, the pair may form a proper motion pair. If the faint object orbits TWA-7, then its apparent magnitudes of H=16.42±0.11 and K=16.34±0.15 mag yield absolute magnitudes consistent with a ∼106.5yr old ∼3Mjup mass object according to the non-gray theory by Burrows et al. (1997ApJ...491..856B). At ∼55pc, the angular separation of ∼2.5" corresponds to ∼138AU, clearly within typical disk sizes. However, position angles and separations are slightly more consistent with a background object than with a companion.

Abstract Copyright:

Journal keyword(s): stars: binaries: visual - stars: individual: TWA-7 - stars: late-type - stars: pre-main sequence

Nomenclature: Fig.2: TWA NNA (No. 7B) added.

Simbad objects: 8

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2020.09.29-16:20:34

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