2010ApJ...710.1724B


Query : 2010ApJ...710.1724B

2010ApJ...710.1724B - Astrophys. J., 710, 1724-1745 (2010/February-3)

HAT-P-11b: a super-Neptune planet transiting a bright K star in the Kepler field.

BAKOS G.A., TORRES G., PAL A., HARTMAN J., KOVACS G., NOYES R.W., LATHAM D.W., SASSELOV D.D., SIPOCZ B., ESQUERDO G.A., FISCHER D.A., JOHNSON J.A., MARCY G.W., BUTLER R.P., ISAACSON H., HOWARD A., VOGT S., KOVACS G., FERNANDEZ J., MOOR A., STEFANIK R.P., LAZAR J., PAPP I. and SARI P.

Abstract (from CDS):

We report on the discovery of HAT-P-11b, the smallest radius transiting extrasolar planet (TEP) discovered from the ground, and the first hot Neptune discovered to date by transit searches. HAT-P-11b orbits the bright (V = 9.587) and metal rich ([Fe/H] = +0.31±0.05) K4 dwarf star GSC 03561-02092 with P = 4.8878162±0.0000071 days and produces a transit signal with depth of 4.2 mmag, the shallowest found by transit searches that is due to a confirmed planet. We present a global analysis of the available photometric and radial velocity (RV) data that result in stellar and planetary parameters, with simultaneous treatment of systematic variations. The planet, like its near-twin GJ 436b, is somewhat larger than Neptune (17 M, 3.8 R) both in mass Mp= 0.081±0.009 MJ(25.8±2.9 M) and radius Rp= 0.422±0.014 RJ(4.73±0.16 R). HAT-P-11b orbits in an eccentric orbit with e = 0.198±0.046 and ω = 355{fdg}2±17{fdg}3, causing a reflex motion of its parent star with amplitude 11.6±1.2 m/s, a challenging detection due to the high level of chromospheric activity of the parent star. Our ephemeris for the transit events is Tc= 2454605.89132 ±0.00032 (BJD), with duration 0.0957±0.0012 days, and secondary eclipse epoch of 2454608.96±0.15 days (BJD). The basic stellar parameters of the host star are M{sstarf}= 0.809+0.020–0.027M, R{sstarf} = 0.752±0.021 R, and Teff{sstarf}= 4780±50 K. Importantly, HAT-P-11 will lie on one of the detectors of the forthcoming Kepler mission; this should make possible fruitful investigations of the detailed physical characteristic of both the planet and its parent star at unprecedented precision. We discuss an interesting constraint on the eccentricity of the system by the transit light curve and stellar parameters. This will be particularly useful for eccentric TEPs with low-amplitude RV variations in Kepler's field. We also present a blend analysis, that for the first time treats the case of a blended transiting hot Jupiter mimicking a transiting hot Neptune, and proves that HAT-P-11b is not such a blend.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual (HAT-P-11, GSC 03561-02092) - techniques: photometric - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/710/1724): table2.dat table3.dat>

CDS comments: In Fig. 11: Stars 2 to 4 aren't in SIMBAD.

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 172 1
2 WASP-11b Pl 03 09 28.5427034552 +30 40 24.868785834           ~ 64 1
3 WASP-11 ** 03 09 28.5433589520 +30 40 24.862993356   12.58 11.57 11.42   K3V 75 1
4 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2884 0
5 HD 40307 PM* 05 54 04.2405000288 -60 01 24.493007640 8.814 8.097 7.147 6.597 6.119 K2.5V 231 1
6 CoRoT-7b Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 379 1
7 HD 69830 PM* 08 18 23.9469682407 -12 37 55.817187530   6.74 5.95     G8:V 498 1
8 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1043 1
9 NAME UMa Region reg 11 00 +50.0           ~ 322 0
10 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 579 1
11 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 718 1
12 HAT-P-3b Pl 13 44 22.5939154049 +48 01 43.206257583           ~ 83 1
13 BD-07 4003 BY* 15 19 26.8269387505 -07 43 20.189497466 13.403 11.76 10.560 9.461 8.911 M3V 595 2
14 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 237 1
15 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 326 1
16 HD 149026 PM* 16 30 29.6185771608 +38 20 50.308980864   8.75 8.14     G0IV 214 1
17 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 501 2
18 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 305 2
19 BD+47 2846 Er* 19 28 59.3538826128 +47 58 10.217007804   10.97 10.48     F6V 283 2
20 BD+47 2936 EB* 19 50 50.2472976936 +48 04 51.101390496       8.8   K4V 261 2
21 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 361 1
22 KOI-1289 * 19 50 50.5016940168 +48 05 01.965229548           ~ 13 1
23 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1289 1
24 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1706 1
25 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 935 1
26 NAME BD+37 4734Bb Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 225 1

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2022.09.28-08:02:17

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