An Extreme-AO Search for Giant Planets around a White Dwarf --VLT/SPHERE performance on a faint target GD 50

Abstract

CONTEXT. Little is known about the planetary systems around single white dwarfs although there is strong evidence that they do exist. AIMS. We performed a pilot study with the extreme-AO system on the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) on the Very Large Telescopes (VLT) to look for giant planets around a young white dwarf, GD 50. METHODS. We were awarded science verification time on the new ESO instrument SPHERE. Observations were made with the InfraRed Dual-band Imager and Spectrograph in classical imaging mode in H band. RESULTS. Despite the faintness of the target (14.2 mag in R band), the AO loop was closed and a strehl of 37\% was reached in H band. No objects were detected around GD 50. We achieved a 5-sigma contrast of 6.2, 8.0 and 8.25 mags at 0{\farcs}2, 0{\farcs}4 and 0{\farcs}6 and beyond, respectively. We exclude any substellar objects more massive than 4.0 M${}_{\text{J}}$ at 6.2 AU, 2.9 M${}_{\text{J}}$ at 12.4 AU and 2.8 M${}_{\text{J}}$ at 18.6 AU and beyond. This rivals the previous upper limit set by Spitzer. We further show that SPHERE is the most promising instrument available to search for close-in substellar objects around nearby white dwarfs.

A&A letters, accepted

References in corpus (15)

• The Gemini Planet Imager: First Light
• The frequency of planetary debris around young white dwarfs
• A gaseous metal disk around a white dwarf
• Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
• Pollution of single white dwarfs by accretion of many small asteroids
• Externally-polluted white dwarfs with dust disks
• Survival of a brown dwarf after engulfment by a red giant star
• Detectable close-in planets around white dwarfs through late unpacking
• Spitzer IRAC Observations of White Dwarfs. II. Massive Planetary and Cold Brown Dwarf Companions to Young and Old Degenerates
• Detection limits for close eclipsing and transiting sub-stellar and planetary companions to white dwarfs in the WASP survey
• A Giant Planet Around a Metal-poor Star of Extragalactic Origin
• A search for planetary eclipses of white dwarfs in the Pan-STARRS1 medium-deep fields
• On the origin of the ultramassive white dwarf GD50
• Finding Planets Around White Dwarf Remnants of Massive Stars
• Precision Astrometry of the Exoplanet Host Candidate GD 66

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