On the detectability of transiting planets orbiting white dwarfs using LSST

Abstract

White dwarfs are one of the few types of stellar objects for which we know almost nothing about the possible existence of companion planets. Recent evidence for metal contaminated atmospheres, circumstellar debris disks and transiting planetary debris all indicate that planets may be likely. However, white dwarf transit surveys are challenging due to the intrinsic faintness of such objects, the short timescale of the transits and the low transit probabilities due to their compact radii. The Large Synoptic Survey Telescope (LSST) offers a remedy to these problems as a deep, half-sky survey with fast exposures encompassing approximately 10 million white dwarfs with $r<24.5$ apparent magnitude. We simulate LSST photometric observations of 3.5 million white dwarfs over a ten-year period and calculate the detectability of companion planets with $P<10$ d via transits. We find typical detection rates in the range of $5\times 10^{-6}$ to $4\times 10^{-4}$ for Ceres-sized bodies to Earth-sized worlds, yielding $\sim 50$ to $4000$ detections for a 100% occurrence rate of each. For terrestrial planets in the continuously habitable zone, we find detection rates of $\sim 10^{-3}$ indicating that LSST would reveal hundreds of such worlds for occurrence rates in the range of 1% to 10%.

9 pages, 6 figures, Submitted for publication in MNRAS on September 6, 2018

References in corpus (11)

• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• The frequency of planetary debris around young white dwarfs
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• The habitability of Proxima Centauri b II. Possible climates and Observability
• 55 Cancri (Copernicus): A Multi-Planet System with a Hot Super-Earth and a Jupiter Analogue
• The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• Transit surveys for Earths in the habitable zones of white dwarfs
• Detection limits for close eclipsing and transiting sub-stellar and planetary companions to white dwarfs in the WASP survey
• The occurrence of planets and other substellar bodies around white dwarfs using K2
• Transiting Planets with LSST I: Potential for LSST Exoplanet Detection

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