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http://hdl.handle.net/20.500.12386/28847
Titolo: | Using HARPS-N to characterize the long-period planets in the PH-2 and Kepler-103 systems | Autori: | Dubber, Sophie C. Mortier, Annelies Rice, Ken Nava, Chantanelle Malavolta, Luca Giles, Helen Coffinet, Adrien Charbonneau, David Vanderburg, Andrew BONOMO, ALDO STEFANO Boschin, Walter Buchhave, Lars A. Collier Cameron, Andrew COSENTINO, Rosario Dumusque, Xavier Ghedina, Adriano HARUTYUNYAN, AVET Haywood, Raphaëlle D. Latham, David López-Morales, Mercedes MICELA, Giuseppina MOLINARI, Emilio Carlo Pepe, Francesco A. Phillips, David Piotto, Giampaolo PORETTI, Ennio Sasselov, Dimitar SOZZETTI, Alessandro Udry, Stéphane |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 490 | Fascicolo: | 4 | Da pagina:: | 5103 | Abstract: | We present confirmation of the planetary nature of PH-2b, as well as the first mass estimates for the two planets in the Kepler-103 system. PH-2b and Kepler-103c are both long-period and transiting, a sparsely populated category of exoplanets. We use Kepler light-curve data to estimate a radius, and then use HARPS-N radial velocities to determine the semi-amplitude of the stellar reflex motion and, hence, the planet mass. For PH-2b we recover a 3.5σ mass estimate of M_ p = 109^{+30}_{-32} M<SUB>⊕</SUB> and a radius of R<SUB>p</SUB> = 9.49 ± 0.16 R<SUB>⊕</SUB>. This means that PH-2b has a Saturn-like bulk density and is the only planet of this type with an orbital period P > 200 d that orbits a single star. We find that Kepler-103b has a mass of M_{p,b} = 11.7^{+4.31}_{-4.72} M<SUB>⊕</SUB> and Kepler-103c has a mass of M_{p,c} = 58.5^{+11.2}_{-11.4} M<SUB>⊕</SUB>. These are 2.5σ and 5σ results, respectively. With radii of R_{p,b} = 3.49^{+0.06}_{-0.05} R<SUB>⊕</SUB> and R_{p,c} = 5.45^{+0.18}_{-0.17} R<SUB>⊕</SUB>, these results suggest that Kepler-103b has a Neptune-like density, while Kepler-103c is one of the highest density planets with a period P > 100 d. By providing high-precision estimates for the masses of the long-period, intermediate-mass planets PH-2b and Kepler-103c, we increase the sample of long-period planets with known masses and radii, which will improve our understanding of the mass-radius relation across the full range of exoplanet masses and radii. | URI: | http://hdl.handle.net/20.500.12386/28847 | URL: | https://academic.oup.com/mnras/article/490/4/5103/5586586 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz2856 | Bibcode ADS: | 2019MNRAS.490.5103D | Fulltext: | open |
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