# HAT-P-20b-HAT-P-23b: Four Massive Transiting Extrasolar Planets

## Author(s): Bakos, Gaspar Aron; Hartman, J; Torres, G; Latham, DW; Kovács, Géza; et al

To refer to this page use: http://arks.princeton.edu/ark:/88435/pr12116
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dc.contributor.authorBakos, Gaspar Aron-
dc.contributor.authorHartman, J-
dc.contributor.authorTorres, G-
dc.contributor.authorLatham, DW-
dc.contributor.authorKovács, Géza-
dc.contributor.authorNoyes, RW-
dc.contributor.authorFischer, DA-
dc.contributor.authorJohnson, JA-
dc.contributor.authorMarcy, GW-
dc.contributor.authorHoward, AW-
dc.contributor.authorKipping, D-
dc.contributor.authorEsquerdo, GA-
dc.contributor.authorShporer, A-
dc.contributor.authorBéky, B-
dc.contributor.authorBuchhave, LA-
dc.contributor.authorPerumpilly, G-
dc.contributor.authorEverett, M-
dc.contributor.authorSasselov, DD-
dc.contributor.authorStefanik, RP-
dc.contributor.authorLázár, J-
dc.contributor.authorPapp, I-
dc.contributor.authorSári, P-
dc.date.accessioned2019-04-10T19:32:20Z-
dc.date.available2019-04-10T19:32:20Z-
dc.date.issued2011-12-01en_US
dc.identifier.citationBakos, GÁ, Hartman, J, Torres, G, Latham, DW, Kovács, Géza, Noyes, RW, Fischer, DA, Johnson, JA, Marcy, GW, Howard, AW, Kipping, D, Esquerdo, GA, Shporer, A, Béky, B, Buchhave, LA, Perumpilly, G, Everett, M, Sasselov, DD, Stefanik, RP, Lázár, J, Papp, I, Sári, P. (2011). HAT-P-20b-HAT-P-23b: Four Massive Transiting Extrasolar Planets. \apj, 742 (116 - 116. doi:10.1088/0004-637X/742/2/116en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr12116-
dc.description.abstractWe report the discovery of four relatively massive (2–7 M J ) transiting extrasolar planets. HAT-P-20b orbits the moderately bright V = 11.339 K3 dwarf star GSC 1910-00239 on a circular orbit, with a period P = 2 . 875317 ± 0 . 000004 days, transit epoch T c = 2455080 . 92661 ± 0 . 00021 (BJD UTC ), and transit dura- tion 0 . 0770 ± 0 . 0008 days. The host star has a mass of 0 . 76 ± 0 . 03 M , radius of 0 . 69 ± 0 . 02 R , effective temperature 4595 ± 80 K, and metallicity [Fe / H] = +0 . 35 ± 0 . 08. The planetary companion has a mass of 7 . 246 ± 0 . 187 M J and a radius of 0 . 867 ± 0 . 033 R J yielding a mean density of 13 . 78 ± 1 . 50 g cm − 3 . HAT-P-21b orbits the V = 11.685 G3 dwarf star GSC 3013-01229 on an eccentric ( e = 0 . 228 ± 0 . 016) orbit, with a period P = 4 . 124481 ± 0 . 000007 days, transit epoch T c = 2454996 . 41312 ± 0 . 00069, and transit duration 0 . 1530 ± 0 . 0027 days. The host star has a mass of 0 . 95 ± 0 . 04 M , radius of 1 . 10 ± 0 . 08 R , effective temperature 5588 ± 80 K, and metallicity [Fe / H] = +0 . 01 ± 0 . 08. The planetary companion has a mass of 4 . 063 ± 0 . 161 M J and a radius of 1 . 024 ± 0 . 092 R J yielding a mean density of 4 . 68 +1 . 59 − 0 . 99 gcm − 3 . HAT-P-21b is a borderline ob- ject between the pM and pL class planets, and the transits occur near apastron. HAT-P-22b orbits the bright V = 9.732 G5 dwarf star HD 233731 on a circular orbit, with a period P = 3 . 212220 ± 0 . 000009 days, transit epoch T c = 2454930 . 22001 ± 0 . 00025, and transit duration 0 . 1196 ± 0 . 0014 days. The host star has a mass of 0 . 92 ± 0 . 03 M , radius of 1 . 04 ± 0 . 04 R , effective temperature 5302 ± 80 K, and metallicity [Fe / H] = +0 . 24 ± 0 . 08. The planet has a mass of 2 . 147 ± 0 . 061 M J and a compact radius of 1 . 080 ± 0 . 058 R J yielding a mean density of 2 . 11 +0 . 40 − 0 . 29 gcm − 3 . The host star also harbors an M-dwarf companion at a wide separation. Finally, HAT-P-23b orbits the V = 12.432 G0 dwarf star GSC 1632-01396 on a close to circular orbit, with a period P = 1 . 212884 ± 0 . 000002 days, transit epoch T c = 2454852 . 26464 ± 0 . 00018, and transit duration 0 . 0908 ± 0 . 0007 days. The host star has a mass of 1 . 13 ± 0 . 04 M , radius of 1 . 20 ± 0 . 07 R , effective temperature 5905 ± 80 K, and metallicity [Fe / H] = +0 . 15 ± 0 . 04. The planetary companion has a mass of 2 . 090 ± 0 . 111 M J and a radius of 1 . 368 ± 0 . 090 R J yielding a mean density of 1 . 01 ± 0 . 18 g cm − 3 . HAT-P-23b is an inflated and massive hot Jupiter on a very short period orbit, and has one of the shortest characteristic infall times (7 . 5 +2 . 9 − 1 . 8 Myr) before it gets engulfed by the star.en_US
dc.language.isoen_USen_US
dc.relation.ispartofAstrophysical Journalen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleHAT-P-20b-HAT-P-23b: Four Massive Transiting Extrasolar Planetsen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1088/0004-637X/742/2/116-
dc.date.eissued2011-11-15en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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