2024AJ....167..153R

Query : 2024AJ....167..153R

2024AJ....167..153R - Astron. J., 167, 153 (2024/April-0)

The TESS-Keck Survey. XII. A Dense 1.8 R⊕ Ultra-short-period Planet Possibly Clinging to a High-mean-molecular-weight Atmosphere after the First Gigayear.

RUBENZAHL R.A., DAI F., HOWARD A.W., LISSAUER J.J., VAN ZANDT J., BEARD C., GIACALONE S., MURPHY J.M.A., CHONTOS A., LUBIN J., BRINKMAN C.L., TYLER D., MacDOUGALL M.G., RICE M., DALBA P.A., MAYO A.W., WEISS L.M., POLANSKI A.S., BLUNT S., YEE S.W., HILL M.L., ANGELO I., TURTELBOOM E.V., HOLCOMB R., BEHMARD A., PIDHORODETSKA D., BATALHA N.M., CROSSFIELD I.J.M., DRESSING C., FULTON B., HUBER D., ISAACSON H., KANE S.R., PETIGURA E.A., ROBERTSON P., SCARSDALE N., MOCNIK T., FETHEROLF T., MALAVOLTA L., MORTIER A., FIORENZANO A. and PEDANI M.

Abstract (from CDS):

The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres. We present the confirmation and characterization of the USP TOI-1347 b, a 1.8 ± 0.1 R⊕ planet on a 0.85 day orbit that was detected with photometry from the TESS mission. We measured radial velocities of the TOI-1347 system using Keck/HIRES and HARPS-N and found the USP to be unusually massive at 11.1 ± 1.2 M⊕. The measured mass and radius of TOI-1347 b imply an Earth-like bulk composition. A thin H/He envelope (>0.01% by mass) can be ruled out at high confidence. The system is between 1 and 1.8 Gyr old; therefore, intensive photoevaporation should have concluded. We detected a tentative phase-curve variation (3σ) and a secondary eclipse (2σ) in TESS photometry, which, if confirmed, could indicate the presence of a high-mean-molecular-weight atmosphere. We recommend additional optical and infrared observations to confirm the presence of an atmosphere and investigate its composition.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Radial velocity - Transit photometry - Exoplanet atmospheres - Super Earths - Exoplanet detection methods

VizieR on-line data: <Available at CDS (J/AJ/167/153): table3.dat>

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TOI-849b Pl 01 54 51.7040408544 -29 25 18.468394788           ~ 59 0
2 HD 20329b Pl 03 16 42.6297956112 +15 39 26.012554056           ~ 13 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 682 1
5 TOI-561b Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 61 0
6 TOI-1347 MS* 18 41 18.4220053824 +70 17 23.788366008   11.95 11.17     ~ 20 0
7 TOI-1347c Pl 18 41 18.4220053824 +70 17 23.788366008           ~ 5 0
8 TOI-1347b Pl 18 41 18.4220053824 +70 17 23.788366008           ~ 10 0
9 Kepler-10b Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 322 1
10 Kepler-7b Pl 19 14 19.5623105760 +41 05 23.367379128           ~ 222 1
11 TOI-1444b Pl 20 21 53.8348831536 +70 56 37.661103276           ~ 25 0
12 TOI-1075b Pl 20 39 53.3385084312 -65 26 57.987806640           ~ 17 0
13 NAME L 119-213b Pl 22 41 58.1171811377 -69 10 08.320741850           ~ 146 0
14 K2-141b Pl 23 23 39.9709098120 -01 11 21.448681332           ~ 104 0
15 CD-38 15670b Pl 23 54 40.2073116552 -37 37 40.524416508           ~ 79 0

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