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Title: WASP-10b: a 3M_J, gas-giant planet transiting a late-type K star
Authors: D.J. Christian, N.P. Gibson, E.K. Simpson, R.A. Street, I. Skillen, D. Pollacco, A. Collier Cameron, Y.C. Joshi, F.P. Keenan, H.C. Stempels, C.A. Haswell, K. Horne, D.R. Anderson, S. Bentley, F. Bouchy, W.I. Clarkson, B. Enoch, L. Hebb, G. Hébrard, C. Hellier, J. Irwin, S.R. Kane, T.A. Lister, B. Loeillet, P. Maxted, M. Mayor, I. McDonald, C. Moutou, A.J. Norton, N. Parley, F. Pont, D. Queloz, R. Ryans, B. Smalley, A.M.S. Smith, I. Todd, S. Udry, R.G. West, P.J. Wheatley, D.M. Wilson
(Version v2)

We report the discovery of WASP-10b, a new transiting extrasolar planet (ESP) discovered by the WASP Consortium and confirmed using NOT FIES and SOPHIE radial velocity data. A 3.09 day period, 29 mmag transit depth, and 2.36 hour duration are derived for WASP-10b using WASP and high precision photometric observations. Simultaneous fitting to the photometric and radial velocity data using a Markov-chain Monte Carlo procedure leads to a planet radius of 1.28R_J, a mass of 2.96M_J and eccentricity of ~0.06. WASP-10b is one of the more massive transiting ESPs, and we compare its characteristics to the current sample of transiting ESP, where there is currently little information for masses greater than ~2M_J and non-zero eccentricities. WASP-10's host star, GSC 2752-00114 (USNO-B1.0 1214-0586164) is among the fainter stars in the WASP sample, with V=12.7 and a spectral type of K5. This result shows promise for future late-type dwarf star surveys.

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Title: HAT-P-10b: A light and moderately hot Jupiter transiting a K dwarf
Authors: G. A. Bakos (1,2), A. Pal (1,4), G. Torres (1), B. Sipocz (1,4), D. W. Latham (1), R. W. Noyes (1), Geza Kovacs (3), J. Hartman (1), G. A. Esquerdo (1), D. A. Fischer (6), J. A. Johnson (7), G. W. Marcy (5), R. P. Butler (8), A. Howard (5), D. D. Sasselov (1), Gabor Kovacs (1), R. P. Stefanik (1), J. Lazar (9), I. Papp (9), P. Sari (9), ((1) CfA, (2) NSF Fellow, (3) Konkoly Observatory, (4) ELTE, (5) UC Berkeley, (6) SFSU, (7) IfA, U of Hawaii, (8) Carnegie, (9) Hungarian Astronomical Association)
(Version v2)

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The HAT and WASP teams have independently identified a new sub-Jupiter mass exoplanet, HAT-P-10/WASP-11b around the star GSC 02340-01714.
The host K3V dwarf star is amongst the smallest, least massive and lowest luminosity stars known to harbour a transiting exoplanet.
This new discovery brings the total number of identified exoplanets to 313.

Position(2000): RA 03 09 28.54, Dec +30 40 24.7

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Title: HAT-P-10b: A light and moderately hot Jupiter transiting a K dwarf
Authors: G. A. Bakos (1,2), A. Pal (1,4), G. Torres (1), B. Sipocz (1,4), D. W. Latham (1), R. W. Noyes (1), Geza Kovacs (3), J. Hartman (1), G. A. Esquerdo (1), D. A. Fischer (6), J. A. Johnson (7), G. W. Marcy (5), R. P. Butler (8), A. Howard (5), D. D. Sasselov (1), Gabor Kovacs (1), R. P. Stefanik (1), J. Lazar (9), I. Papp (9), P. Sari (9), ((1) CfA, (2) NSF Fellow, (3) Konkoly Observatory, (4) ELTE, (5) UC Berkeley, (6) SFSU, (7) IfA, U of Hawaii, (8) Carnegie, (9) Hungarian Astronomical Association)

We report on the discovery of HAT-P-10b, the lowest mass (0.46 ± 0.03 MJ) transiting extrasolar planet (TEP) discovered to date by transit searches. HAT-P-10b orbits the moderately bright V=11.89 K dwarf GSC 02340-01714, with a period P = 3.7224690 ± 0.0000067 d, transit epoch Tc = 2454729.90631 ± 0.00030 (BJD) and duration 0.1100 ± 0.0015 d. HAT-P-10b has a radius of 1.05 +(0.05)-(0.03) RJ yielding a mean density of 0.498±0.064 g cm^-3 . Comparing these observations with recent theoretical models we find that HAT-P-10 is consistent with a ~4.5 Gyr, coreless, pure hydrogen and helium gas giant planet. With an equilibrium temperature of Teq = 1030 +(26)-(19)K, HAT-P-10b is one of the coldest TEPs. Curiously, its Safronov number Theta = 0.047 ± 0.003 falls close to the dividing line between the two suggested TEP populations.

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