TY - JOUR
T1 - Using HARPS-N to characterize the long-period planets in the PH-2 and Kepler-103 systems
AU - Dubber, Sophie C.
AU - Mortier, Annelies
AU - Rice, Ken
AU - Nava, Chantanelle
AU - Malavolta, Luca
AU - Giles, Helen
AU - Coffinet, Adrien
AU - Charbonneau, David
AU - Vanderburg, Andrew
AU - Bonomo, Aldo S.
AU - Boschin, Walter
AU - Buchhave, Lars A.
AU - Cameron, Andrew Collier
AU - Cosentino, Rosario
AU - Dumusque, Xavier
AU - Ghedina, Adriano
AU - Harutyunyan, Avet
AU - Haywood, Raphaelle D.
AU - Latham, David
AU - López-Morales, Mercedes
AU - Micela, Giusi
AU - Molinari, Emilio
AU - Pepe, Francesco A.
AU - Phillips, David
AU - Piotto, Giampaolo
AU - Poretti, Ennio
AU - Sasselov, Dimitar
AU - Sozzetti, Alessandro
AU - Udry, Stéphane
N1 - Funding: Senior Kavli Institute Fellowships at the University of Cambridge (AM); UK Science & Technology Facilities Council (STFC) consolidated grant number ST/R000824/1 (ACC).
PY - 2019/12
Y1 - 2019/12
N2 - 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 Mp=109+30−32 M⊕ and a radius of Rp = 9.49 ± 0.16 R⊕. 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 Mp,b=11.7+4.31−4.72 M⊕ and Kepler-103c has a mass of Mp,c=58.5+11.2−11.4 M⊕. These are 2.5σ and 5σ results, respectively. With radii of Rp,b=3.49+0.06−0.05 R⊕ and Rp,c=5.45+0.18−0.17 R⊕, 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.
AB - 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 Mp=109+30−32 M⊕ and a radius of Rp = 9.49 ± 0.16 R⊕. 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 Mp,b=11.7+4.31−4.72 M⊕ and Kepler-103c has a mass of Mp,c=58.5+11.2−11.4 M⊕. These are 2.5σ and 5σ results, respectively. With radii of Rp,b=3.49+0.06−0.05 R⊕ and Rp,c=5.45+0.18−0.17 R⊕, 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.
KW - Techniques: photometric
KW - Techniques: radial velocities
KW - Techniques: spectroscopic
KW - Planets and satellites; composition
U2 - 10.1093/mnras/stz2856
DO - 10.1093/mnras/stz2856
M3 - Article
SN - 0035-8711
VL - 490
SP - 5103
EP - 5121
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -