2019A&A...627A..49Z

Query : 2019A&A...627A..49Z

2019A&A...627A..49Z - Astronomy and Astrophysics, volume 627A, 49-49 (2019/7-1)

The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star.

ZECHMEISTER M., DREIZLER S., RIBAS I., REINERS A., CABALLERO J.A., BAUER F.F., BEJAR V.J.S., GONZALEZ-CUESTA L., HERRERO E., LALITHA S., LOPEZ-GONZALEZ M.J., LUQUE R., MORALES J.C., PALLE E., RODRIGUEZ E., RODRIGUEZ LOPEZ C., TAL-OR L., ANGLADA-ESCUDE G., QUIRRENBACH A., AMADO P.J., ABRIL M., ACEITUNO F.J., ACEITUNO J., ALONSO-FLORIANO F.J., AMMLER-VON EIFF M., ANTONA JIMENEZ R., ANWAND-HEERWART H., ARROYO-TORRES B., AZZARO M., BAROCH D., BARRADO D., BECERRIL S., BENITEZ D., BERDINAS Z.M., BERGOND G., BLUHM P., BRINKMOLLER M., DEL BURGO C., CALVO ORTEGA R., CANO J., CARDONA GUILLEN C., CARRO J., CARDENAS VAZQUEZ M.C., CASAL E., CASASAYAS-BARRIS N., CASANOVA V., CHATURVEDI P., CIFUENTES C., CLARET A., COLOME J., CORTES-CONTRERAS M., CZESLA S., DIEZ-ALONSO E., DORDA R., FERNANDEZ M., FERNANDEZ-MARTIN A., FUHRMEISTER B., FUKUI A., GALADI-ENRIQUEZ D., GALLARDO CAVA I., GARCIA DE LA FUENTE J., GARCIA-PIQUER A., GARCIA VARGAS M.L., GESA L., GONGORA RUEDA J., GONZALEZ-ALVAREZ E., GONZALEZ HERNANDEZ J.I., GONZALEZ-PEINADO R., GROZINGER U., GUARDIA J., GUIJARRO A., DE GUINDOS E., HATZES A.P., HAUSCHILDT P.H., HEDROSA R.P., HELMLING J., HENNING T., HERMELO I., HERNANDEZ ARABI R., HERNANDEZ CASTANO L., HERNANDEZ OTERO F., HINTZ D., HUKE P., HUBER A., JEFFERS S.V., JOHNSON E.N., DE JUAN E., KAMINSKI A., KEMMER J., KIM M., KLAHR H., KLEIN R., KLUTER J., KLUTSCH A., KOSSAKOWSKI D., KURSTER M., LABARGA F., LAFARGA M., LLAMAS M., LAMPON M., LARA L.M., LAUNHARDT R., LAZARO F.J., LODIEU N., LOPEZ DEL FRESNO M., LOPEZ-PUERTAS M., LOPEZ SALAS J.F., LOPEZ-SANTIAGO J., MAGAN MADINABEITIA H., MALL U., MANCINI L., MANDEL H., MARFIL E., MARIN MOLINA J.A., MAROTO FERNANDEZ D., MARTIN E.L., MARTIN-FERNANDEZ P., MARTIN-RUIZ S., MARVIN C.J., MIRABET E., MONTANES-RODRIGUEZ P., MONTES D., MORENO-RAYA M.E., NAGEL E., NARANJO V., NARITA N., NORTMANN L., NOWAK G., OFIR A., OSHAGH M., PANDURO J., PARVIAINEN H., PASCUAL J., PASSEGGER V.M., PAVLOV A., PEDRAZ S., PEREZ-CALPENA A., PEREZ MEDIALDEA D., PERGER M., PERRYMAN M.A.C., RABAZA O., RAMON BALLESTA A., REBOLO R., REDONDO P., REFFERT S., REINHARDT S., RHODE P., RIX H.-W., RODLER F., RODRIGUEZ TRINIDAD A., ROSICH A., SADEGI S., SANCHEZ-BLANCO E., SANCHEZ CARRASCO M.A., SANCHEZ-LOPEZ A., SANZ-FORCADA J., SARKIS P., SARMIENTO L.F., SCHAFER S., SCHMITT J.H.M.M., SCHOFER P., SCHWEITZER A., SEIFERT W., SHULYAK D., SOLANO E., SOTA A., STAHL O., STOCK S., STRACHAN J.B.P., STUBER T., STURMER J., SUAREZ J.C., TABERNERO H.M., TALA PINTO M., TRIFONOV T., VEREDAS G., VICO LINARES J.I., VILARDELL F., WAGNER K., WOLTHOFF V., XU W., YAN F. and ZAPATERO OSORIO M.R.

Abstract (from CDS):

Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0 V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part of the CARMENES search for exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements of Teegarden's Star and analysed them for planetary signals. Methods. We find periodic variability in the radial velocities of Teegarden's Star. We also studied photometric measurements to rule out stellar brightness variations mimicking planetary signals. Results. We find evidence for two planet candidates, each with 1.1M_⊕ minimum mass, orbiting at periods of 4.91 and 11.4d, respectively. No evidence for planetary transits could be found in archival and follow-up photometry. Small photometric variability is suggestive of slow rotation and old age. Conclusions. The two planets are among the lowest-mass planets discovered so far, and they are the first Earth-mass planets around an ultra-cool dwarf for which the masses have been determined using radial velocities.

Abstract Copyright: © ESO 2019

Journal keyword(s): methods: data analysis - planetary systems - stars: late-type - stars: individual: Teegarden's Star

VizieR on-line data: <Available at CDS (J/A+A/627/A49): rv_vis.dat rv_nir.dat>

Simbad objects: 16

Full paper

View the references in ADS

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	NAME Teegarden's Star c	Pl	02 53 00.8917932409	+16 52 52.632190137						~	24	0
2	NAME Teegarden's Star	LM*	02 53 00.8917932409	+16 52 52.632190137		17.21		14.1		dM6	154	0
3	NAME Teegarden's Star b	Pl	02 53 00.8917932409	+16 52 52.632190137						~	21	0
4	K2-101b	Pl	08 41 22.5783027954	+18 56 01.947224876						~	20	0
5	LP 321-222	LM*	12 46 51.6144758160	+31 48 10.900214430		19.9		17.7		M5V	37	0
6	NAME Proxima Centauri b	Pl	14 29 42.9461331854	-62 40 46.164680672						~	345	0
7	NAME Proxima Centauri	Er*	14 29 42.9461331854	-62 40 46.164680672	14.21	12.95	11.13	9.45	7.41	M5.5Ve	1262	0
8	HD 156384C	PM*	17 18 58.8272997802	-34 59 48.612673382	12.96	11.79	10.22	10.05	8.82	M1.5V	214	1
9	Kepler-62	Er*	18 52 51.0518497680	+45 20 59.399622996		14.702	13.982	13.807		G5	124	1
10	Kepler-442	Ro*	19 01 27.9742961064	+39 16 48.224136216						~	30	0
11	Kepler-1229	Er*	19 49 56.8076265768	+46 59 48.103495728				15.830		M0	49	0
12	TRAPPIST-1g	Pl	23 06 29.3684948589	-05 02 29.037301866						~	177	0
13	TRAPPIST-1b	Pl	23 06 29.3684948589	-05 02 29.037301866						~	229	0
14	TRAPPIST-1e	Pl	23 06 29.3684948589	-05 02 29.037301866						~	258	0
15	TRAPPIST-1f	Pl	23 06 29.3684948589	-05 02 29.037301866						~	211	0
16	TRAPPIST-1	LM*	23 06 29.3684948589	-05 02 29.037301866			18.798	16.466	14.024	M7.5e	928	0

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