High-contrast imaging of HD 29992 and HD 198365 with the Gemini Planet Imager

L. GRACÍA ; R . PETRUCCI ; E. JOFRÉ; M. GÓMEZ

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2022 vol. 151 p. 4999 - 4999

0035-8711

ased on high-contrast images obtained with the Gemini Planet Imager (GPI), we report the discovery of two point-like sources at angular separation ∼ 0.18 and 0.80 arcsec from the stars HD 29992 and HD196385. A combined analysis of the new GPI observations and images from the literature indicates that the source close to HD 29992 could be a companion to the star. Concerning HD 196385, the small number of contaminants (∼0.5) suggests that the detected source may be gravitationally bound to the star. For both systems, we discarded the presence of other potential companions with m > 75 M Jup at distances ∼ 0.3–1.3 arcsec. From stellar model atmospheres and low-resolution GPI spectra, we derive masses of ∼0.2–0.3 MSun for these sources. Using a Markov-chain Monte Carlo approach, we performed a joint fi t of the new astrometry measurements and published radial velocity data to characterize the possible orbits. For HD 196385B, the median dynamic mass is in agreement w