2020ApJ...898L..11G

Query : 2020ApJ...898L..11G

2020ApJ...898L..11G - Astrophys. J., 898, L11-L11 (2020/July-3)

NGTS-11 b (TOI-1847 b): a transiting warm Saturn recovered from a TESS single-transit event.

GILL S., WHEATLEY P.J., COOKE B.F., JORDAN A., NIELSEN L.D., BAYLISS D., ANDERSON D.R., VINES J.I., LENDL M., ACTON J.S., ARMSTRONG D.J., BOUCHY F., BRAHM R., BRYANT E.M., BURLEIGH M.R., CASEWELL S.L., EIGMULLER P., ESPINOZA N., GILLEN E., GOAD M.R., GRIEVES N., GUNTHER M.N., HENNING T., HOBSON M.J., HOGAN A., JENKINS J.S., McCORMAC J., MOYANO M., OSBORN H.P., POLLACCO D., QUELOZ D., RAUER H., RAYNARD L., ROJAS F., SARKIS P., SMITH A.M.S., TALA PINTO M., TILBROOK R.H., UDRY S., WATSON C.A. and WEST R.G.

Abstract (from CDS):

We report the discovery of NGTS-11 b (=TOI-1847b), a transiting Saturn in a 35.46 day orbit around a mid K-type star (Teff = 5050 ± 80 K). We initially identified the system from a single-transit event in a TESS full-frame image light curve. Following 79 nights of photometric monitoring with an NGTS telescope, we observed a second full transit of NGTS-11 b approximately one year after the TESS single-transit event. The NGTS transit confirmed the parameters of the transit signal and restricted the orbital period to a set of 13 discrete periods. We combined our transit detections with precise radial-velocity measurements to determine the true orbital period and measure the mass of the planet. We find NGTS-11 b has a radius of 0.817±0.0320.028RJup, a mass of 0.344±0.0730.092MJup, and an equilibrium temperature of just 435±3234 K, making it one of the coolest known transiting gas giants. NGTS-11 b is the first exoplanet to be discovered after being initially identified as a TESS single-transit event, and its discovery highlights the power of intense photometric monitoring in recovering longer-period transiting exoplanets from single-transit events.

Abstract Copyright: © 2020. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Exoplanet detection methods - Exoplanets - Extrasolar gas giants - Photometry - High resolution spectroscopy

VizieR on-line data: <Available at CDS (J/ApJ/898/L11): coralie.dat feros.dat harps.dat tess.dat ngts.dat>

Simbad objects: 7

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Number of rows : 7
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 NGTS-11 * 01 34 05.1360759912 -14 25 09.152486616   13.304 12.411 12.297 11.48 ~ 23 0
2 NGTS-11b Pl 01 34 05.1360759912 -14 25 09.152486616           ~ 15 0
3 UCAC4 378-001694 PM* 01 34 06.8943504648 -14 25 49.769691204   17.300 15.854 15.636   ~ 1 0
4 UCAC4 378-001695 * 01 34 08.4793136400 -14 25 37.654092300   15.911 15.187 15.111   ~ 1 0
5 UCAC4 178-001612 PM* 01 40 01.2538819392 -54 31 21.660241008   13.285 12.632 12.631   ~ 7 0
6 CPD-68 3538 SB* 22 50 59.9743541424 -67 30 54.190507140   11.162 10.703 10.42   ~ 14 0
7 HD 224286 SB* 23 56 38.7607545192 -44 43 08.684220540   10.04 9.34     K0IV/V+A/F 31 0

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