2017A&A...605L...9C

Query : 2017A&A...605L...9C

2017A&A...605L...9C - Astronomy and Astrophysics, volume 605L9-9 (2017/9-1)

Discovery of a warm, dusty giant planet around HIP 65426.

CHAUVIN G., DESIDERA S., LAGRANGE A.-M., VIGAN A., GRATTON R., LANGLOIS M., BONNEFOY M., BEUZIT J.-L., FELDT M., MOUILLET D., MEYER M., CHEETHAM A., BILLER B., BOCCALETTI A., D'ORAZI V., GALICHER R., HAGELBERG J., MAIRE A.-L., MESA D., OLOFSSON J., SAMLAND M., SCHMIDT T.O.B., SISSA E., BONAVITA M., CHARNAY B., CUDEL M., DAEMGEN S., DELORME P., JANIN-POTIRON P., JANSON M., KEPPLER M., LE COROLLER H., LIGI R., MARLEAU G.D., MESSINA S., MOLLIERE P., MORDASINI C., MULLER A., PERETTI S., PERROT C., RODET L., ROUAN D., ZURLO A., DOMINIK C., HENNING T., MENARD F., SCHMID H.-M., TURATTO M., UDRY S., VAKILI F., ABE L., ANTICHI J., BARUFFOLO A., BAUDOZ P., BAUDRAND J., BLANCHARD P., BAZZON A., BUEY T., CARBILLET M., CARLE M., CHARTON J., CASCONE E., CLAUDI R., COSTILLE A., DEBOULBE A., DE CAPRIO V., DOHLEN K., FANTINEL D., FEAUTRIER P., FUSCO T., GIGAN P., GIRO E., GISLER D., GLUCK L., HUBIN N., HUGOT E., JAQUET M., KASPER M., MADEC F., MAGNARD Y., MARTINEZ P., MAUREL D., LE MIGNANT D., MOLLER-NILSSON O., LLORED M., MOULIN T., ORIGNE A., PAVLOV A., PERRET D., PETIT C., PRAGT J., PUGET P., RABOU P., RAMOS J., RIGAL R., ROCHAT S., ROELFSEMA R., ROUSSET G., ROUX A., SALASNICH B., SAUVAGE J.-F., SEVIN A., SOENKE C., STADLER E., SUAREZ M., WEBER L., WILDI F., ANTONIUCCI S., AUGEREAU J.-C., BAUDINO J.-L., BRANDNER W., ENGLER N., GIRARD J., GRY C., KRAL Q., KOPYTOVA T., LAGADEC E., MILLI J., MOUTOU C., SCHLIEDER J., SZULAGYI J., THALMANN C. and WAHHAJ Z.

Abstract (from CDS):

Aims. The SHINE program is a high-contrast near-infrared survey of 600 young, nearby stars aimed at searching for and characterizing new planetary systems using VLT/SPHERE's unprecedented high-contrast and high-angular-resolution imaging capabilities. It is also intended to place statistical constraints on the rate, mass and orbital distributions of the giant planet population at large orbits as a function of the stellar host mass and age to test planet-formation theories.
Methods. We used the IRDIS dual-band imager and the IFS integral field spectrograph of SPHERE to acquire high-contrast coronagraphic differential near-infrared images and spectra of the young A2 star HIP 65426. It is a member of the ∼17Myr old Lower Centaurus-Crux association.
Results. At a separation of 830 mas (92au projected) from the star, we detect a faint red companion. Multi-epoch observations confirm that it shares common proper motion with HIP 65426. Spectro-photometric measurements extracted with IFS and IRDIS between 0.95 and 2.2µm indicate a warm, dusty atmosphere characteristic of young low-surface-gravity L5-L7 dwarfs. Hot-start evolutionary models predict a luminosity consistent with a 6-12M_Jup, T_eff=1300-1600K and R=1.5±0.1R_Jup giant planet. Finally, the comparison with Exo-REM and PHOENIX BT-Settl synthetic atmosphere models gives consistent effective temperatures but with slightly higher surface gravity solutions of log(g)=4.0-5.0 with smaller radii (1.0-1.3R_Jup).
Conclusions. Given its physical and spectral properties, HIP 65426 b occupies a rather unique placement in terms of age, mass, and spectral-type among the currently known imaged planets. It represents a particularly interesting case to study the presence of clouds as a function of particle size, composition, and location in the atmosphere, to search for signatures of non-equilibrium chemistry, and finally to test the theory of planet formation and evolution.

Abstract Copyright: © ESO, 2017

Journal keyword(s): instrumentation: adaptive optics - instrumentation: high angular resolution - methods: observational - planets and satellites: atmospheres - planets and satellites: formation - planets and satellites: formation

VizieR on-line data: <Available at CDS (J/A+A/605/L9): hip65426.dat>

Simbad objects: 29

Full paper

View the references in ADS

Number of rows : 29

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	NGC 104	GlC	00 24 05.359	-72 04 53.20			4.09			~	4158	0
2	2MASS J00470038+6803543	BD*	00 47 00.38664	+68 03 54.3672						L9pec	86	0
3	PSO J057.2893+15.2433	BD*	03 49 09.44	+15 14 36.0						L7	13	0
4	2MASS J03552337+1133437	BD*	03 55 23.3735910810	+11 33 43.797034332						L5gamma	142	0
5	* 51 Eri b	Pl	04 37 36.1326090888	-02 28 24.775726260						~	238	0
6	V* AB Dor	TT*	05 28 44.8712165880	-65 26 55.199147208	8.259	7.856	6.999	6.496	5.993	K0V	1080	0
7	* bet Pic	PM*	05 47 17.0876901	-51 03 59.441135	4.13	4.03	3.86	3.74	3.58	A6V	2087	1
8	* bet Pic b	Pl	05 47 17.0876901	-51 03 59.441135						~	627	1
9	NAME AB Dor Moving Group	MGr	06 38 53.4	-42 50 04						~	540	0
10	HD 95086b	Pl	10 57 03.0215719872	-68 40 02.449216128						~	127	1
11	TWA 27B	BD*	12 07 33.50	-39 32 54.4						L3	321	0
12	HD 106906B	BD*	12 17 52.61	-55 58 26.6						L2.5	115	0
13	NAME Lower Centaurus Crux	As*	12 19	-57.1						~	565	1
14	HD 113901	V*	13 07 33.5032697280	-52 54 19.742908284		9.35	8.81			F5V	31	0
15	2MASS J13121764-5508258	Y*?	13 12 17.6479456576	-55 08 25.935851186		13.068	11.841	11.498	10.43	K5Ve	20	0
16	HD 116434	**	13 24 36.0977360304	-51 30 16.044711840		7.08	6.98		6.87	A2V	95	0
17	HD 116434C	BD*	13 24 36.13	-51 30 16.7						L5-7	123	1
18	NAME beta Pic Moving Group	MGr	14 30	-42.0						~	894	0
19	HD 143567B	LM*	16 01 55.65696	-21 58 53.0076						M8	43	0
20	NAME UScoCTIO 108B	BD?	16 05 54.09504	-18 18 48.8592						~	51	0
21	RX J1609.5-2105	Or*	16 09 30.3075290712	-21 04 58.943800992		14.21	12.77	12.25	10.99	M0.0e	103	0
22	RX J1609.5-2105B	LM*	16 09 30.377	-21 04 56.97						~	123	0
23	2MASS J16103232-1913085	Or*	16 10 32.3277488136	-19 13 08.392480032						M8.5-9.5	20	0
24	NAME Upper Sco-Cen	As*	16 15	-24.2						~	1497	1
25	NAME GSC 06214-00210B	LM*	16 21 54.678	-20 43 11.33						~	102	0
26	V* PZ Tel	BY*	18 53 05.8735056984	-50 10 49.897437168		9.22	8.342		7.464	G9IV	364	0
27	2MASS J21140802-2251358	BD*	21 14 08.02560	-22 51 35.8380						L7.5	126	0
28	2MASSW J2148162+400359	BD*	21 48 16.2986589335	+40 03 59.331851811						L7	80	0
29	HD 218396	El*	23 07 28.7157209544	+21 08 03.310767492		6.21	5.953			F0+VkA5mA5	1285	0

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