WASP-80b: a gas giant transiting a cool dwarf
Amaury H. M. J. Triaud, D. R. Anderson, A. Collier Cameron, A. P., Doyle, A. Fumel, M. Gillon, C. Hellier, E. Jehin, M. Lendl, C. Lovis, P. F., L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Segransan, B. Smalley, A. M., S. Smith, S. Udry, R. G. West, P. J. Wheatley
TL;DR
This paper reports the discovery of a gas giant exoplanet transiting a cool dwarf star, with significant transit depth and interesting stellar rotation characteristics, making it a valuable target for further atmospheric studies.
Contribution
The discovery of WASP-80b, a gas giant transiting a cool dwarf star with unique transit and stellar rotation features, expanding known exoplanet demographics.
Findings
Large transit depth suitable for transmission spectroscopy
Discrepancy in stellar rotational velocity measurements
Potential orbital misalignment or additional broadening source
Abstract
We report the discovery of a planet transiting the star WASP-80 (1SWASP J201240.26-020838.2; 2MASS J20124017-0208391; TYC 5165-481-1; BPM 80815; V=11.9, K=8.4). Our analysis shows this is a 0.55 +/- 0.04 Mjup, 0.95 +/- 0.03 Rjup gas giant on a circular 3.07 day orbit around a star with a spectral type between K7V and M0V. This system produces one of the largest transit depths so far reported, making it a worthwhile target for transmission spectroscopy. We find a large discrepancy between the v sin i inferred from stellar line broadening and the observed amplitude of the Rossiter-McLaughlin effect. This can be understood either by an orbital plane nearly perpendicular to the stellar spin or by an additional, unaccounted for source of broadening.
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