Using HARPS-N to characterize the long-period planets in the PH-2 and Kepler-103 systems
Date Issued
2019
Author(s)
Dubber, Sophie C.
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Mortier, Annelies
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Rice, Ken
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Nava, Chantanelle
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Giles, Helen
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Coffinet, Adrien
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Charbonneau, David
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Vanderburg, Andrew
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•
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Buchhave, Lars A.
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Collier Cameron, Andrew
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Dumusque, Xavier
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•
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Haywood, Raphaëlle D.
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Latham, David
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López-Morales, Mercedes
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•
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Pepe, Francesco A.
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Phillips, David
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Piotto, Giampaolo
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•
Sasselov, Dimitar
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•
Udry, Stéphane
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⊕ 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 M_{p,b} = 11.7^{+4.31}_{-4.72} M⊕ and Kepler-103c has a mass of M_{p,c} = 58.5^{+11.2}_{-11.4} M⊕. These are 2.5σ and 5σ results, respectively. With radii of R_{p,b} = 3.49^{+0.06}_{-0.05} R⊕ and R_{p,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.
Volume
490
Issue
4
Start page
5103
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.490.5103D
Rights
open.access
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