HATS-47b, HATS-48Ab, HATS-49b, and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs*

Abstract

site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations made with the MPG 2.2 m Telescope at the ESO Observatory in La Silla. Based on observations collected at the European Southern Observatory. This paper includes data gathered with the 6.5 meter Magellan Telescopes at Las Campanas Observatory, Chile. ABSTRACTWe report the discovery of four transiting giant planets around K dwarfs. The planets HATS-47b, HATS-48Ab, HATS-49b, and HATS-72b have masses of 0.369 +0.031 −0.021 M J , 0.243 +0.022 −0.030 M J , 0.353 +0.038 −0.027 M J and 0.1254 ± 0.0039 M J , respectively, and radii of 1.117 ± 0.014 R J , 0.800 ± 0.015 R J , 0.765 ± 0.013 R J , and 0.7224 ± 0.0032 R J , respectively. The planets orbit close to their host stars with orbital periods of 3.9228 d, 3.1317 d, 4.1480 d and 7.3279 d, respectively. The hosts are main sequence K dwarfs with masses of 0.674 +0.016 −0.012 M , 0.7279 ± 0.0066 M , 0.7133 ± 0.0075 M , and 0.7311 ± 0.0028, and with V -band magnitudes of V = 14.829 ± 0.010, 14.35 ± 0.11, 14.998 ± 0.040 and 12.469 ± 0.010. The Super-Neptune HATS-72b (a.k.a. WASP-191b and TOI 294.01) was independently identified as a transiting planet candidate by the HATSouth, WASP and TESS surveys, and we present a combined analysis of all of the data gathered by each of these projects (and their follow-up programs). An exceptionally precise mass is measured for HATS-72b thanks to high-precision radial velocity (RV) measurements obtained with VLT/ESPRESSO, FEROS, HARPS and Magellan/PFS. We also incorporate TESS observations of the warm Saturn-hosting systems HATS-47 (a.k.a. TOI 1073.01), HATS-48A and HATS-49. HATS-47 was independently identified as a candidate by the TESS team, while the other two systems were not previously identified from the TESS data. The RV orbital variations are measured for these systems using Magellan/PFS. HATS-48A has a resolved 5. 4 neighbor in Gaia DR2, which is a common-proper-motion binary star companion to HATS-48A with a mass of 0.22 M and a current projected physical separation of ∼1,400 au.

Search for (sub)stellar companions of exoplanet hosts by exploring the second ESA-Gaia data release

“…16: This companion was reported by (Hartman et al, 2020), who used the Gaia DR2 astrometry to confirm its companionship with the exoplanet host star HATS-48 A, as done in this work. 17: NGTS-7 B was revealed by (Jackman et al, 2019) as companion of the exoplanet host star NGTS-7 A using Gaia DR2 astrometry, as done in this study.…”

Search for (sub)stellar Companions of Exoplanet Hosts by Exploring the Second ESA-Gaia Data Release

“…We prove the equidistance of both stars with their Gaia DR2 astrometry, which also confirms their common proper motion. p This companion was reported by (Hartman et al, 2020), who used the Gaia DR2 astrometry to confirm its companionship with the exoplanet host star HATS-48 A, as done in this work. q NGTS-7 B was revealed by (Jackman et al, 2019) as companion of the exoplanet host star NGTS-7 A using Gaia DR2 astrometry, as done in this study.…”

Characterisation of 92 Southern TESS Candidate Planet Hosts and a New Photometric [Fe/H] Relation for Cool Dwarfs

“…Comparison with HATS-48 A b (TOI 1067.01) from Hartman et al (2020) shows an inconsistent value of 𝑅 𝑃 /𝑅 ★ , indicating a difference in how we have modelled the light curves. While we have access to an additional sector of TESS data, the difference primarily appears to come from a) including RVs in their fit, and b) their use of an additional 'dilution factor' when fitting to account for nearby unresolved stars.…”