2012A&A...540A..99E

Query : 2012A&A...540A..99E

2012A&A...540A..99E - Astronomy and Astrophysics, volume 540A99-99 (2012/4-1)

Factors affecting the radii of close-in transiting exoplanets.

ENOCH B., COLLIER CAMERON A. and HORNE K.

Abstract (from CDS):

The radius of an exoplanet may be affected by various factors, including irradiation received from the host star, the mass of the planet and its heavy element content. A significant number of transiting exoplanets have now been discovered for which the mass, radius, semi-major axis, host star metallicity and stellar effective temperature are known. We use multivariate regression models to determine the power-law dependence of planetary radius on planetary equilibrium temperature Teq, planetary mass Mp, stellar metallicity [Fe/H], orbital semi-major axis a, and tidal heating rate Htidal, for 119 transiting planets in three distinct mass regimes. We fit models initially to all 119 planets, resulting in fairly high scatter between fitted and observed radii, and subsequently to three subsets of these planets: Saturn-mass planets, Jupiter-mass planets, and high-mass planets. We find models for each subset that fit the observed planetary radii well and show the importance of the various environmental parameters on each subset. We determine that heating leads to larger planet radii, as expected, increasing mass leads to increased or decreased radii of low-mass (<0.5RJ) and high-mass (>2.0RJ) planets, respectively (with no mass effect on Jupiter-mass planets), and increased host-star metallicity leads to smaller planetary radii, indicating a relationship between host-star metallicity and planet heavy element content. For Saturn-mass planets, a good fit to the radii may be obtained from log(Rp/RJ)=-0.077+0.450log(Mp/MJ)-0.314[Fe/H]+0.671log(a/AU)+0.398log(Teq/K). The radii of Jupiter-mass planets may be fit by log(Rp/RJ)=-2.217+0.856log(Teq/K)+0.291log(a/AU). High-mass planets' radii are best fit by log(Rp/RJ)=-1.067+0.380log(Teq/K)-0.093log(Mp/MJ)-0.057[Fe/H]+0.019log(Htidal/1x1020). These equations produce a very good fit to the observed radii, with a mean absolute difference between fitted and observed radius of 0.11RJ, compared to the mean reported uncertainty in observed radius of 0.07RJ. A clear distinction is seen between the core-dominated Saturn-mass (0.1-0.5MJ) planets, whose radii are determined almost exclusively by their mass and heavy element content, and the gaseous envelope-dominated Jupiter-mass (0.5-2.0MJ) planets, whose radii increase strongly with irradiating flux, partially offset by a power-law dependence on orbital separation.

Abstract Copyright: ∼

Journal keyword(s): methods: statistical - planetary systems - planets and satellites: general - planets and satellites: physical evolution

Simbad objects: 123

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Number of rows : 123
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 WASP-44b Pl 00 15 36.7694650296 -11 56 17.284833996           ~ 39 1
2 WASP-32b Pl 00 15 50.8077262344 +01 12 01.588900896           ~ 47 1
3 WASP-26b Pl 00 18 24.7008060816 -15 16 02.275778784           ~ 50 1
4 WASP-1b Pl 00 20 40.0745768856 +31 59 23.954809596           ~ 134 1
5 WASP-45b Pl 00 20 56.9941303416 -35 59 53.746646676           ~ 44 1
6 HAT-P-19b Pl 00 38 04.0135699416 +34 42 41.553538560           ~ 74 1
7 HAT-P-16b Pl 00 38 17.5584024024 +42 27 47.216738232           ~ 67 1
8 HAT-P-28b Pl 00 52 00.1876130976 +34 43 42.205232532           ~ 29 1
9 HD 10069b Pl 01 37 25.0332798696 -45 40 40.374717456           ~ 444 1
10 HAT-P-32b Pl 02 04 10.2774374568 +46 41 16.212315084           ~ 198 1
11 HAT-P-29b Pl 02 12 31.4787454416 +51 46 43.563748620           ~ 34 1
12 HD 15082b Pl 02 26 51.0582618096 +37 33 01.736482032           ~ 403 1
13 WASP-50b Pl 02 54 45.1341750384 -10 53 53.025224640           ~ 46 1
14 WASP-11b Pl 03 09 28.5433589520 +30 40 24.862993356           ~ 83 1
15 HAT-P-25b Pl 03 13 44.4981245184 +25 11 50.689343148           ~ 41 1
16 WASP-22b Pl 03 31 16.3267124400 -23 49 10.840600632           ~ 51 1
17 BD+57 793b Pl 04 21 52.7048156328 +57 49 01.889294952           ~ 234 1
18 BD-06 1077b Pl 05 04 19.6323194352 -06 13 47.378185788           ~ 40 1
19 CoRoT-19b Pl 06 28 08.0586807504 -00 10 14.532816504           ~ 35 1
20 WASP-12b Pl 06 30 32.7966092352 +29 40 20.263502460           ~ 847 1
21 CoRoT-20b Pl 06 30 52.9022402976 +00 13 36.858436428           ~ 43 1
22 CoRoT-18b Pl 06 32 41.3776636176 -00 01 53.725599732           ~ 45 1
23 CoRoT-12b Pl 06 43 03.7630314144 -01 17 47.144066352           ~ 39 1
24 CoRoT-7b Pl 06 43 49.4690164104 -01 03 46.826642700           ~ 422 1
25 CoRoT-21b Pl 06 44 12.6302250707 -00 17 56.987010804           ~ 22 2
26 WASP-23b Pl 06 44 30.6133625784 -42 45 42.666796404           ~ 35 1
27 CoRoT-5b Pl 06 45 06.5406550272 +00 48 54.905787036           ~ 52 1
28 CoRoT-1b Pl 06 48 19.1723766840 -03 06 07.710745140           ~ 187 1
29 CoRoT-4b Pl 06 48 46.7134456728 -00 40 21.969631416           ~ 69 1
30 CoRoT-13b Pl 06 50 53.0726565720 -05 05 11.190799896           ~ 38 1
31 CoRoT-14b Pl 06 53 41.8087553160 -05 32 09.683309760           ~ 39 1
32 HAT-P-24b Pl 07 15 18.0193656720 +14 15 45.408025008           ~ 47 1
33 HAT-P-9b Pl 07 20 40.4564614032 +37 08 26.342829060           ~ 73 1
34 XO-4b Pl 07 21 33.1602434760 +58 16 05.109533364           ~ 76 1
35 HAT-P-20b Pl 07 27 39.9488720808 +24 20 11.516231112           ~ 97 1
36 HAT-P-33b Pl 07 32 44.2173520776 +33 50 06.115051104           ~ 59 1
37 XO-5b Pl 07 46 51.9614762400 +39 05 40.460854956           ~ 58 1
38 BD+50 1471b Pl 07 48 06.4723053776 +50 13 32.920598923           ~ 170 1
39 BD+06 1909b Pl 08 15 47.9802408792 +05 50 12.350816484           ~ 73 1
40 BD+06 1909 Em* 08 15 47.9802408792 +05 50 12.350816484   10.95 10.35     F7 85 1
41 HAT-P-13b Pl 08 39 31.8072358440 +47 21 07.273799280           ~ 128 1
42 WASP-36b Pl 08 46 19.2977439552 -08 01 37.015743396           ~ 54 1
43 BD+34 1976b Pl 09 20 24.7145388600 +33 52 56.696039796           ~ 69 1
44 WASP-19b Pl 09 53 40.0765648584 -45 39 33.057187596           ~ 423 1
45 WASP-43b Pl 10 19 38.0088913464 -09 48 22.605801336           ~ 442 1
46 HD 233731b Pl 10 22 43.5923328528 +50 07 42.062425248           ~ 52 1
47 NAME OGLE-TR 211b Pl 10 40 14.3828284632 -62 27 20.018236464           ~ 31 1
48 NAME OGLE-TR-132b Pl 10 50 34.5943868112 -61 57 26.138690064           ~ 105 1
49 NAME OGLE-TR-113b Pl 10 52 24.2810533560 -61 26 48.845675976           ~ 120 1
50 NAME OGLE-TR-111b Pl 10 53 17.8069115424 -61 24 20.607791112           ~ 114 1
51 CD-23 9677b Pl 11 01 35.8978277184 -23 51 38.386984896           ~ 59 1
52 NAME OGLE2-TR L9b Pl 11 07 55.1808382920 -61 08 46.537684260           ~ 30 1
53 NAME OGLE-TR 182b Pl 11 09 18.7248783144 -61 05 42.962710884           ~ 37 1
54 WASP-31b Pl 11 17 45.3578677224 -19 03 17.217631800           ~ 143 1
55 HAT-P-21b Pl 11 25 05.9859193536 +41 01 40.664937216           ~ 43 1
56 CD-29 9873b Pl 12 42 28.4949559632 -30 38 23.529045948           ~ 44 1
57 WASP-25b Pl 13 01 26.3760406392 -27 31 19.922387484           ~ 50 1
58 HAT-P-3b Pl 13 44 22.5937349736 +48 01 43.205733624           ~ 113 1
59 Qatar 2b Pl 13 50 37.4100326640 -06 48 14.421574044           ~ 55 1
60 CD-31 10766b Pl 13 55 42.7120177608 -32 09 34.616222028           ~ 84 1
61 HAT-P-12b Pl 13 57 33.4668726399 +43 29 36.601508739           ~ 201 1
62 WASP-16b Pl 14 18 43.9225013904 -20 16 31.843626168           ~ 60 1
63 WASP-39b Pl 14 29 18.4151689656 -03 26 40.204480380           ~ 345 1
64 BD+22 2716b Pl 14 33 06.3571702344 +21 53 40.981395876           ~ 170 1
65 WASP-37b Pl 14 47 46.5619510032 +01 03 53.799541704           ~ 34 1
66 WASP-40b Pl 14 51 04.1870399712 +05 56 50.548526376           ~ 47 1
67 HAT-P-27 * 14 51 04.1870399712 +05 56 50.548526376   13.18 12.19 11.98 11.23 G8 71 1
68 WASP-24b Pl 15 08 51.7367171808 +02 20 35.962165104           ~ 58 1
69 BD+36 2593b Pl 15 19 57.9203617176 +36 13 46.738078788           ~ 86 1
70 CD-27 10695b Pl 15 59 50.9491505016 -28 03 42.312819096           ~ 313 1
71 BD+28 2507b Pl 16 02 11.8462322592 +28 10 10.420201452           ~ 195 1
72 HD 146389b Pl 16 15 50.3653280520 +10 01 57.284258556           ~ 57 1
73 HD 147506b Pl 16 20 36.3576063720 +41 02 53.106772488           ~ 274 1
74 HD 149026b Pl 16 30 29.6185771608 +38 20 50.308980864           ~ 388 1
75 HAT-P-18b Pl 17 05 23.1475097496 +33 00 44.940001716           ~ 153 1
76 BD+38 2917b Pl 17 20 27.8781604680 +38 14 31.908984936           ~ 95 1
77 NAME OGLE-TR-10b Pl 17 51 28.2593510544 -29 52 35.231024064           ~ 90 1
78 TrES-3 Pl 17 52 07.0184259768 +37 32 46.237377840           ~ 245 2
79 TOI-2124b Pl 17 53 13.0489562760 +37 12 42.586493328           ~ 228 2
80 NAME OGLE-TR-56b Pl 17 56 35.5016678064 -29 32 21.479240220           ~ 202 1
81 HAT-P-31b Pl 18 06 09.0498478464 +26 25 35.989962204           ~ 41 1
82 HAT-P-5b Pl 18 17 37.3126923960 +36 37 17.170401468           ~ 71 1
83 CoRoT-16b Pl 18 34 05.9187219720 -06 00 09.244242972           ~ 28 2
84 BD+35 3293b Pl 18 34 31.6252443960 +35 39 41.491899468           ~ 126 1
85 CoRoT-17b Pl 18 34 47.8211904504 -06 36 44.113807836           ~ 29 1
86 CoRoT-23b Pl 18 39 07.8405328128 +04 21 28.034371188           ~ 24 1
87 CoRoT-11b Pl 18 42 44.9499236256 +05 56 15.652972716           ~ 52 1
88 CoRoT-6b Pl 18 44 17.4078666144 +06 39 47.513042100           ~ 49 1
89 Kepler-8b Pl 18 45 09.1489991376 +42 27 03.891327156           ~ 98 1
90 NAME V672 Lyr b Pl 19 04 09.8515616256 +36 37 57.446680296           ~ 354 1
91 Kepler-12b Pl 19 04 58.4220633696 +50 02 25.271762064           ~ 97 1
92 Kepler-1b Pl 19 07 14.0375836512 +49 18 59.091482160           ~ 349 2
93 Kepler-14b Pl 19 10 50.110176 +47 19 58.87632           ~ 65 1
94 Kepler-7b Pl 19 14 19.5623105760 +41 05 23.367379128           ~ 222 1
95 WASP-48b Pl 19 24 38.9614451424 +55 28 23.332107108           ~ 65 1
96 CoRoT-8b Pl 19 26 21.2425572360 +01 25 35.177500524           ~ 59 1
97 CoRoT-2b Pl 19 27 06.4944378024 +01 23 01.359897468           ~ 256 1
98 BD+47 2846b Pl 19 28 59.3538826128 +47 58 10.217007804           ~ 415 1
99 Kepler-15b Pl 19 44 48.1365025872 +49 08 24.297539028           ~ 61 1
100 Kepler-6b Pl 19 47 20.9379557640 +48 14 23.759029608           ~ 106 1
101 Kepler-17b Pl 19 53 34.8643397568 +47 48 54.049530564           ~ 110 1
102 Kepler-5b Pl 19 57 37.6884643560 +44 02 06.189718884           ~ 106 1
103 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1610 1
104 Qatar 1b Pl 20 13 31.6172746704 +65 09 43.492226796           ~ 88 1
105 TrES-5 Pl 20 20 53.2481854560 +59 26 55.575277296           ~ 58 2
106 HAT-P-23b Pl 20 24 29.7234392904 +16 45 43.811510112           ~ 81 1
107 WASP-2B * 20 30 54.179 +06 25 46.18           M0-1.5 23 1
108 HD 197286b Pl 20 44 10.2208462488 -39 13 30.855881604           ~ 76 1
109 WASP-46b Pl 21 14 56.8598669520 -55 52 18.458085144           ~ 54 1
110 HAT-P-17b Pl 21 38 08.7310010424 +30 29 19.446386748           ~ 102 1
111 HD 209458b Pl 22 03 10.7727465312 +18 53 03.549393384           ~ 2037 1
112 HD 209458 V* 22 03 10.7727465312 +18 53 03.549393384   8.21 7.63     F9V 1193 1
113 BD+34 4779b Pl 22 52 09.8636387352 +35 26 49.608422844           ~ 85 1
114 NAME BD+37 4734Bb Pl 22 57 46.8442481880 +38 40 30.358351704           ~ 268 1
115 WASP-21b Pl 23 09 58.2534443016 +18 23 45.885822792           ~ 71 1
116 WASP-6b Pl 23 12 37.7368282608 -22 40 26.273805024           ~ 150 1
117 WASP-10b Pl 23 15 58.3006181424 +31 27 46.296056268           ~ 118 1
118 WASP-4b Pl 23 34 15.0857248317 -42 03 41.047972591           ~ 197 1
119 K2-1b Pl 23 34 27.8814904872 -01 34 48.110067912           ~ 43 1
120 BD+41 4831b Pl 23 39 05.8102996968 +42 27 57.505293900           ~ 94 1
121 CD-40 15273b Pl 23 51 31.0839097560 -39 54 24.258188484           ~ 88 1
122 WASP-5b Pl 23 57 23.7564672192 -41 16 37.743700800           ~ 103 1
123 CD-35 16019b Pl 23 59 36.0711872328 -35 01 52.923618408           ~ 144 0

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