2023ApJ...946L...6M

Query : 2023ApJ...946L...6M

2023ApJ...946L...6M - Astrophys. J., 946, L6 (2023/March-3)

The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256-1257 b.

MILES B.E., BILLER B.A., PATAPIS P., WORTHEN K., RICKMAN E., HOCH K.K.W., SKEMER A., PERRIN M.D., WHITEFORD N., CHEN C.H., SARGENT B., MUKHERJEE S., MORLEY C.V., MORAN S.E., BONNEFOY M., PETRUS S., CARTER A.L., CHOQUET E., HINKLEY S., WARD-DUONG K., LEISENRING J.M., MILLAR-BLANCHAER M.A., PUEYO L., RAY S., SALLUM S., STAPELFELDT K.R., STONE J.M., WANG J.J., ABSIL O., BALMER W.O., BOCCALETTI A., BONAVITA M., BOOTH M., BOWLER B.P., CHAUVIN G., CHRISTIAENS V., CURRIE T., DANIELSKI C., FORTNEY J.J., GIRARD J.H., GRADY C.A., GREENBAUM A.Z., HENNING T., HINES D.C., JANSON M., KALAS P., KAMMERER J., KENNEDY G.M., KENWORTHY M.A., KERVELLA P., LAGAGE P.-O., LEW B.W.P., LIU M.C., MACINTOSH B., MARINO S., MARLEY M.S., MAROIS C., MATTHEWS E.C., MATTHEWS B.C., MAWET D., McELWAIN M.W., METCHEV S., MEYER M.R., MOLLIERE P., PANTIN E., QUIRRENBACH A., REBOLLIDO I., REN B.B., SCHNEIDER G., VASIST M., WYATT M.C., ZHOU Y., BRIESEMEISTER Z.W., BRYAN M.L., CALISSENDORFF P., CANTALLOUBE F., CUGNO G., DE FURIO M., DUPUY T.J., FACTOR S.M., FAHERTY J.K., FITZGERALD M.P., FRANSON K., GONZALES E.C., HOOD C.E., HOWE A.R., KRAUS A.L., KUZUHARA M., LAGRANGE A.-M., LAWSON K., LAZZONI C., LIU P., LLOP-SAYSON J., LLOYD J.P., MARTINEZ R.A., MAZOYER J., QUANZ S.P., ADAMS REDAI J., SAMLAND M., SCHLIEDER J.E., TAMURA M., TAN X., UYAMA T., VIGAN A., VOS J.M., WAGNER K., WOLFF S.G., YGOUF M., ZHANG X., ZHANG K. and ZHANG Z.

Abstract (from CDS):

We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a <20 MJup widely separated (∼8″, a = 150 au), young, planetary-mass companion that shares photometric colors and spectroscopic features with the directly imaged exoplanets HR 8799c, d, and e. As an L-to-T transition object, VHS 1256 b exists along the region of the color-magnitude diagram where substellar atmospheres transition from cloudy to clear. We observed VHS 1256 b with JWST's NIRSpec IFU and MIRI MRS modes for coverage from 1 to 20 μm at resolutions of ∼1000-3700. Water, methane, carbon monoxide, carbon dioxide, sodium, and potassium are observed in several portions of the JWST spectrum based on comparisons from template brown dwarf spectra, molecular opacities, and atmospheric models. The spectral shape of VHS 1256 b is influenced by disequilibrium chemistry and clouds. We directly detect silicate clouds, the first such detection reported for a planetary-mass companion.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - Exoplanet atmospheres - Extrasolar gaseous giant planets

VizieR on-line data: <Available at CDS (J/ApJ/946/L6): sp.dat model.dat>

Simbad objects: 13

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Number of rows : 13
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 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 238 0
2 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
3 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 321 0
4 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 115 0
5 SIPS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L7 154 0
6 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 123 1
7 TYC 4433-1800-1 * 18 08 34.7360078880 +69 27 28.721915028   12.18 11.69     A3V 39 0
8 2MASSW J2224438-015852 BD* 22 24 43.8544128559 -01 58 53.284975671           L4.5V 150 0
9 HD 218396c Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 312 1
10 HD 218396e Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 255 1
11 HD 218396b Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 323 1
12 HD 218396d Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 286 1
13 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1285 0

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