Monthly Notices of the Royal Astronomical Society, Vol. 491, No.2, (2020), 2834–2844
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Identifier
dc.identifier.other
10.1093/mnras/stz3140
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/174749
Abstract
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We report the discovery, by the next generation transit survey (NGTS), of two hot Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (T-eff = 5241 +/- 50 K) with a period of 2.49970 d, and a V = 12.80 F8V star (T-eff = 6330 +/- 130 K) in 4.43527 d, respectively. The transits were independently verified by follow-up photometric observations with the South African Astronomical Observatory 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS, and CORALIE radial velocities. NGTS-8b has a mass, 0.93(-0.03)(+0.04)M(J) and a radius, 1.09 +/- 0.03 R-J similar to Jupiter, resulting in a density of 0.89(-0.07)(+0.08) g cm(-3). This is in contrast to NGTS-9b, which has a mass of 2.90 +/- 0.17M(J) and a radius of 1.07 +/- 0.06 R-J, resulting in a much greater density of 2.93(-0.49)(+0.53) g cm(-3). Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.
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Patrocinador
dc.description.sponsorship
Science & Technology Facilities Council (STFC) ST/M001962/1
Science & Technology Facilities Council (STFC) ST/L000733/1 ST/P000495/1 ST/P000312/1 ST/N000757/1
Swiss National Science Foundation (SNSF)
Winton Philanthropies
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) CONICYT FONDECYT 1161218
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) CONICYT PIA/BASAL PB06
STFC via an Ernest Rutherford Fellowship ST/R00384X/1
German Research Foundation (DFG) SPP 1992 RA 714/13-1
Gruber Foundation Fellowship
MIT's Kavli Institute
European Research Council under the FP/2007-2013 ERC grant 336480
Australian Research Council
Simons Foundation 327127