2019AJ....158...32K

Query : 2019AJ....158...32K

2019AJ....158...32K - Astron. J., 158, 32-32 (2019/July-0)

The L 98-59 system: three transiting, terrestrial-size planets orbiting a nearby M dwarf.

KOSTOV V.B., SCHLIEDER J.E., BARCLAY T., QUINTANA E.V., COLON K.D., BRANDE J., COLLINS K.A., FEINSTEIN A.D., HADDEN S., KANE S.R., KREIDBERG L., KRUSE E., LAM C., MATTHEWS E., MONTET B.T., POZUELOS F.J., STASSUN K.G., WINTERS J.G., RICKER G., VANDERSPEK R., LATHAM D., SEAGER S., WINN J., JENKINS J.M., AFANASEV D., ARMSTRONG J.J.D., ARNEY G., BOYD P., BARENTSEN G., BARKAOUI K., BATALHA N.E., BEICHMAN C., BAYLISS D., BURKE C., BURDANOV A., CACCIAPUOTI L., CARSON A., CHARBONNEAU D., CHRISTIANSEN J., CIARDI D., CLAMPIN M., COLLINS K.I., CONTI D.M., COUGHLIN J., COVONE G., CROSSFIELD I., DELREZ L., DOMAGAL-GOLDMAN S., DRESSING C., DUCROT E., ESSACK Z., EVERETT M.E., FAUCHEZ T., FOREMAN-MACKEY D., GAN T., GILBERT E., GILLON M., GONZALES E., HAMANN A., HEDGES C., HOCUTT H., HOFFMAN K., HORCH E.P., HORNE K., HOWELL S., HYNES S., IRELAND M., IRWIN J.M., ISOPI G., JENSEN E.L.N., JEHIN E., KALTENEGGER L., KIELKOPF J.F., KOPPARAPU R., LEWIS N., LOPEZ E., LISSAUER J.J., MANN A.W., MALLIA F., MANDELL A., MATSON R.A., MAZEH T., MONSUE T., MORAN S.E., MORAN V., MORLEY C.V., MORRIS B., MUIRHEAD P., MUKAI K., MULLALLY S., MULLALLY F., MURRAY C., NARITA N., PALLE E., PIDHORODETSKA D., QUINN D., RELLES H., RINEHART S., RITSKO M., RODRIGUEZ J.E., ROWDEN P., ROWE J.F., SEBASTIAN D., SEFAKO R., SHAHAF S., SHPORER A., REYES N.T., TENENBAUM P., TING E.B., TWICKEN J.D., VAN BELLE G.T., VEGA L., VOLOSIN J., WALKOWICZ L.M. and YOUNGBLOOD A.

Abstract (from CDS):

We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-size planets transiting L 98-59 (TOI-175, TIC 307210830)-a bright M dwarf at a distance of 10.6 pc. Using the Gaia-measured distance and broadband photometry, we find that the host star is an M3 dwarf. Combined with the TESS transits from three sectors, the corresponding stellar parameters yield planet radii ranging from 0.8 R⊕ to 1.6 R⊕. All three planets have short orbital periods, ranging from 2.25 to 7.45 days with the outer pair just wide of a 2:1 period resonance. Diagnostic tests produced by the TESS Data Validation Report and the vetting package DAVE rule out common false-positive sources. These analyses, along with dedicated follow-up and the multiplicity of the system, lend confidence that the observed signals are caused by planets transiting L 98-59 and are not associated with other sources in the field. The L 98-59 system is interesting for a number of reasons: the host star is bright (V = 11.7 mag, K = 7.1 mag) and the planets are prime targets for further follow-up observations including precision radial-velocity mass measurements and future transit spectroscopy with the James Webb Space Telescope; the near-resonant configuration makes the system a laboratory to study planetary system dynamical evolution; and three planets of relatively similar size in the same system present an opportunity to study terrestrial planets where other variables (age, metallicity, etc.) can be held constant. L 98-59 will be observed in four more TESS sectors, which will provide a wealth of information on the three currently known planets and have the potential to reveal additional planets in the system.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): planets and satellites: detection - stars: individual: (TIC 307210830, TOI-175) - techniques: photometric

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 UCAC4 109-016501 EB* 08 17 58.1212211424 -68 17 46.050848412   15.49 14.46 14.23   ~ 1 0
2 L 98-59 PM* 08 18 07.6214406393 -68 18 46.805365587   13.22 11.685 11.294   M3V 92 0
3 NAME L 98-59 b Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 39 0
4 NAME L 98-59 c Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 49 0
5 NAME L 98-59 d Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 50 0
6 2MASS J08181129-6819373 EB* 08 18 11.2969088256 -68 19 37.315844004           ~ 1 0
7 2MASS J08181825-6818430 EB* 08 18 18.2653629576 -68 18 43.061827104           ~ 1 0
8 HD 72337 * 08 27 16.7555269464 -70 05 36.540579660   5.483 5.507     A0V 31 0
9 NAME L 320-124b Pl 10 14 51.7786855411 -47 09 24.192778106           ~ 170 0
10 L 320-124 PM* 10 14 51.7786855411 -47 09 24.192778106       13.067   M4 126 0
11 NAME Proxima Centauri b Pl 14 29 42.9461331854 -62 40 46.164680672           ~ 370 0
12 BD-07 4003b Pl 15 19 26.8269387505 -07 43 20.189497466           ~ 88 1
13 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 816 2
14 Kepler-296 ** 19 06 09.6025302984 +49 26 14.396852760           M2V 86 0
15 Kepler-186 Er* 19 54 36.6535147488 +43 57 18.025920324   16.731 15.290 14.833   M1V 127 0
16 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1001 0

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