TY - JOUR
T1 - Using HARPS-N to characterise 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 - Lopez-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, Stephane
N1 - Accepted for publication in MNRAS
PY - 2019/10/12
Y1 - 2019/10/12
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 exoplanet. We use {\it 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
3.5-σ 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
days 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
days. 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 exoplanet. We use {\it 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
3.5-σ 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
days 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
days. 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 - astro-ph.EP
U2 - 10.1093/mnras/stz2856
DO - 10.1093/mnras/stz2856
M3 - Article
SN - 0035-8711
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
ER -