2021AJ....162..148W

Query : 2021AJ....162..148W

2021AJ....162..148W - Astron. J., 162, 148-148 (2021/October-0)

Detection and bulk properties of the HR 8799 planets with high-resolution spectroscopy.

WANG J.J., RUFFIO J.-B., MORRIS E., DELORME J.-R., JOVANOVIC N., PEZZATO J., ECHEVERRI D., FINNERTY L., HOOD C., ZANAZZI J.J., BRYAN M.L., BOND C.Z., CETRE S., MARTIN E.C., MAWET D., SKEMER A., BAKER A., XUAN J.W., WALLACE J.K., WANG J., BARTOS R., BLAKE G.A., BODEN A., BUZARD C., CALVIN B., CHUN M., DOPPMANN G., DUPUY T.J., DUCHENE G., FENG Y.K., FITZGERALD M.P., FORTNEY J., FREEDMAN R.S., KNUTSON H., KONOPACKY Q., LILLEY S., LIU M.C., LOPEZ R., LUPU R., MARLEY M.S., MESHKAT T., MILES B., MILLAR-BLANCHAER M., RAGLAND S., ROY A., RUANE G., SAPPEY B., SCHOFIELD T., WEISS L., WETHERELL E., WIZINOWICH P. and YGOUF M.

Abstract (from CDS):

Using the Keck Planet Imager and Characterizer, we obtained high-resolution (R ∼ 35,000) K-band spectra of the four planets orbiting HR 8799. We clearly detected H2O and CO in the atmospheres of HR 8799 c, d, and e, and tentatively detected a combination of CO and H2O in b. These are the most challenging directly imaged exoplanets that have been observed at high spectral resolution to date when considering both their angular separations and flux ratios. We developed a forward-modeling framework that allows us to jointly fit the spectra of the planets and the diffracted starlight simultaneously in a likelihood-based approach and obtained posterior probabilities on their effective temperatures, surface gravities, radial velocities, and spins. We measured vsin(i) values of 10.1–2.7+2.8kms–1 for HR 8799 d and 15.0–2.6+2.3kms–1 for HR 8799 e, and placed an upper limit of <14 km s–1 of HR 8799 c. Under two different assumptions of their obliquities, we found tentative evidence that rotation velocity is anticorrelated with companion mass, which could indicate that magnetic braking with a circumplanetary disk at early times is less efficient at spinning down lower-mass planets.

Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet atmospheres - Exoplanet formation - High angular resolution - High resolution spectroscopy

Simbad objects: 17

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Number of rows : 17
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 2MASS J02495436-0558015 BD* 02 49 54.36624 -05 58 01.5816           L2 17 0
2 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
3 HD 44627B BD* 06 19 12.9988086984 -58 03 20.198341332           L1 155 1
4 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 321 0
5 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 115 0
6 CD-40 8434 TT* 14 08 10.1545500744 -41 23 52.573291080   13.42 12.18 11.71 10.506 K7IVe 546 0
7 V* GQ Lup B LM* 15 49 12.05 -35 39 05.1           M9e 165 1
8 * ups Her PM* 16 02 47.8978183032 +46 02 12.133917132 4.33 4.616 4.709     B9.5III 248 0
9 NAME SR 12C LM* 16 27 19.6577175120 -24 41 49.239711024           M9.0 61 0
10 * 42 Her PM* 16 38 44.8450092648 +48 55 42.032370216 8.21 6.45 4.90     M2III 85 0
11 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 126 0
12 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 143 0
13 HD 218396e Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 255 1
14 HD 218396d Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 286 1
15 HD 218396c Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 312 1
16 HD 218396b Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 323 1
17 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1285 0

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