2019ApJ...876L..24G

Query : 2019ApJ...876L..24G

2019ApJ...876L..24G - Astrophys. J., 876, L24-L24 (2019/May-2)

The transiting multi-planet system HD15337: two nearly equal-mass planets straddling the radius gap.

GANDOLFI D., FOSSATI L., LIVINGSTON J.H., STASSUN K.G., GRZIWA S., BARRAGAN O., FRIDLUND M., KUBYSHKINA D., PERSSON C.M., DAI F., LAM K.W.F., ALBRECHT S., BATALHA N., BECK P.G., BO JUSTESEN A., CABRERA J., CARTWRIGHT S., COCHRAN W.D., CSIZMADIA S., DAVIES M.D., DEEG H.J., EIGMULLER P., ENDL M., ERIKSON A., ESPOSITO M., GARCIA R.A., GOEKE R., GONZALEZ-CUESTA L., GUENTHER E.W., HATZES A.P., HIDALGO D., HIRANO T., HJORTH M., KABATH P., KNUDSTRUP E., KORTH J., LI J., LUQUE R., MATHUR S., MONTANES RODRIGUEZ P., NARITA N., NESPRAL D., NIRAULA P., NOWAK G., PALLE E., PATZOLD M., PRIETO-ARRANZ J., RAUER H., REDFIELD S., RIBAS I., SKARKA M., SMITH A.M.S., ROWDEN P., TORRES G., VAN EYLEN V. and VEZIE M.L.

Abstract (from CDS):

We report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V = 9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 3 and 4. We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8 days, a mass of 7.51–1.01+1.09M⊕ and a radius of 1.64 ± 0.06 R⊕, HD 15337 b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD 15337 c has an orbital period of 17.2 days, a mass of 8.11–1.69+1.82M⊕, and a radius of 2.39 ± 0.12 R⊕, suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD 15337 c hosts a hydrogen-dominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150 Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.

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

Journal keyword(s): planetary systems - planets and satellites: detection - planets and satellites: fundamental parameters - planets and satellites: individual HD15337 b , c - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/ApJ/876/L24): table2.dat table3.dat>

Simbad objects: 8

goto Full paper

goto View the references in ADS

Number of rows : 8
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 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
2 HD 15337 PM* 02 27 28.3781273256 -27 38 06.736755624   9.95 9.09     K1V 122 0
3 HD 15337b Pl 02 27 28.3781273256 -27 38 06.736755624           ~ 38 0
4 HD 15337c Pl 02 27 28.3781273256 -27 38 06.736755624           ~ 30 0
5 * pi. Men c Pl 05 37 09.8868446714 -80 28 08.834553264           ~ 117 0
6 * pi. Men PM* 05 37 09.8868446714 -80 28 08.834553264   6.25 5.67     G0V 390 1
7 HD 106315 * 12 13 53.3962381416 -00 23 36.553445304   9.402 8.951     F5V 62 0
8 BD-02 5958 PM* 23 27 04.8376907739 -01 17 10.582653030   11.57 10.10 10.09 8.89 K6V 110 0

To bookmark this query, right click on this link: simbad:objects in 2019ApJ...876L..24G and select 'bookmark this link' or equivalent in the popup menu