2019ApJ...883L..16C

Query : 2019ApJ...883L..16C

2019ApJ...883L..16C - Astrophys. J., 883, L16-L16 (2019/September-3)

A super-earth and sub-Neptune transiting the late-type M dwarf LP 791-18.

CROSSFIELD I.J.M., WAALKES W., NEWTON E.R., NARITA N., MUIRHEAD P., MENT K., MATTHEWS E., KRAUS A., KOSTOV V., KOSIAREK M.R., KANE S.R., ISAACSON H., HALVERSON S., GONZALES E., EVERETT M., DRAGOMIR D., COLLINS K.A., CHONTOS A., BERARDO D., WINTERS J.G., WINN J.N., SCOTT N.J., ROJAS-AYALA B., RIZZUTO A.C., PETIGURA E.A., PETERSON M., MOCNIK T., MIKAL-EVANS T., MEHRLE N., MATSON R., KUZUHARA M., IRWIN J., HUBER D., HUANG C., HOWELL S., HOWARD A.W., HIRANO T., FULTON B.J., DUPUY T., DRESSING C.D., DALBA P.A., CHARBONNEAU D., BURT J., BERTA-THOMPSON Z., BENNEKE B., WATANABE N., TWICKEN J.D., TAMURA M., SCHLIEDER J., SEAGER S., ROSE M.E., RICKER G., QUINTANA E., LEPINE S., LATHAM D.W., KOTANI T., JENKINS J.M., HORI Y., COLON K. and CALDWELL D.A.

Abstract (from CDS):

Planets occur most frequently around cool dwarfs, but only a handful of specific examples are known to orbit the latest-type M stars. Using TESS photometry, we report the discovery of two planets transiting the low-mass star called LP 791-18 (identified by TESS as TOI 736). This star has spectral type M6V, effective temperature 2960 K, and radius 0.17 R☉, making it the third-coolest star known to host planets. The two planets straddle the radius gap seen for smaller exoplanets; they include a 1.1R⊕ planet on a 0.95 day orbit and a 2.3R⊕ planet on a 5 day orbit. Because the host star is small the decrease in light during these planets' transits is fairly large (0.4% and 1.7%). This has allowed us to detect both planets' transits from ground-based photometry, refining their radii and orbital ephemerides. In the future, radial velocity observations and transmission spectroscopy can both probe these planets' bulk interior and atmospheric compositions, and additional photometric monitoring would be sensitive to even smaller transiting planets.

Abstract Copyright: © 2019. The American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Exoplanet systems - High resolution spectroscopy - Low mass stars - Transit photometry

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* YZ Cet Er* 01 12 30.6368826382 -16 59 56.358011559 15.315 13.885 12.074 10.696 8.938 M4.0Ve 264 0
2 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21   14.1   dM6 157 0
3 * pi. Men PM* 05 37 09.8868446714 -80 28 08.834553264   6.25 5.67     G0V 326 1
4 * 23 Sex Pu* 10 21 02.0059724664 +02 17 22.997775480 5.9 6.547 6.644     B2IV/V 108 0
5 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 721 0
6 HD 95234 V* 10 59 30.9271237992 -16 21 13.335565428   7.483 5.879     M1III 29 0
7 NAME LP 791-18b Pl 11 02 45.9546199392 -16 24 22.288196376           ~ 16 0
8 NAME LP 791-18c Pl 11 02 45.9546199392 -16 24 22.288196376           ~ 17 0
9 LP 791-18 PM* 11 02 45.9546199392 -16 24 22.288196376           M6V 28 0
10 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1299 0
11 G 139-21 PM* 17 15 18.9339850845 +04 57 50.066612336       14.394   M4.5V 325 1
12 Kepler-42 Er* 19 28 52.5688740811 +44 37 08.989819665   17.8   16.06   M4V 114 1
13 NAME L 119-213b Pl 22 41 58.1171811377 -69 10 08.320741850           ~ 102 0
14 L 119-213 Er* 22 41 58.1171811377 -69 10 08.320741850   17.3       ~ 52 0
15 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 666 1
16 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 995 0

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