Characterization of small planets with<i>Kepler</i>and HARPS-N

Bonomo, A. S.; Sozzetti, A.; Malavolta, L.; Rice, Ken; Dumusque, X.; Cameron, A. Collier; Latham, David W.; Molinari, E.; Pepe, F.; Udry, S.

doi:10.1051/epjconf/201510106011

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…While waiting for the new generation of ground-and spacebased transit searches targeting bright stars, planet density estimates from the follow-up of the Kepler candidates with HARPS-N have already been presented in several papers (Pepe et al 2013;Dumusque et al 2014;Bonomo et al 2014;Dressing et al 2015). They are populating the low-radius regime of the mass-radius relation for small exoplanets with candidates for which precise mass and radius could be determined.…”

Section: Introductionmentioning

confidence: 99%

The HARPS-N Rocky Planet Search

Motalebi

Udry

Gillon

et al. 2015

A&A

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We know now from radial velocity surveys and transit space missions that planets only a few times more massive than our Earth are frequent around solar-type stars. Fundamental questions about their formation history, physical properties, internal structure, and atmosphere composition are, however, still to be solved. We present here the detection of a system of four low-mass planets around the bright (V = 5.5) and close-by (6.5 pc) star HD 219134. This is the first result of the Rocky Planet Search programme with HARPS-N on the Telescopio Nazionale Galileo in La Palma. The inner planet orbits the star in 3.0935 ± 0.0003 days, on a quasicircular orbit with a semi-major axis of 0.0382 ± 0.0003 AU. Spitzer observations allowed us to detect the transit of the planet in front of the star making HD 219134 b the nearest known transiting planet to date. From the amplitude of the radial velocity variation (2.25 ± 0.22 ms −1 ) and observed depth of the transit (359 ± 38 ppm), the planet mass and radius are estimated to be 4.36 ± 0.44 M ⊕ and 1.606 ± 0.086 R ⊕ , leading to a mean density of 5.76 ± 1.09 g cm −3 , suggesting a rocky composition. One additional planet with minimum-mass of 2.78 ± 0.65 M ⊕ moves on a close-in, quasi-circular orbit with a period of 6.767 ± 0.004 days. The third planet in the system has a period of 46.66 ± 0.08 days and a minimum-mass of 8.94 ± 1.13 M ⊕ , at 0.233 ± 0.002 AU from the star. Its eccentricity is 0.46 ± 0.11. The period of this planet is close to the rotational period of the star estimated from variations of activity indicators (42.3 ± 0.1 days). The planetary origin of the signal is, however, the preferred solution as no indication of variation at the corresponding frequency is observed for activity-sensitive parameters. Finally, a fourth additional longer-period planet of mass of 71 M ⊕ orbits the star in 1842 days, on an eccentric orbit (e = 0.34 ± 0.17) at a distance of 2.56 AU.Key words. techniques: radial velocities -techniques: photometric -stars: individual: HD 219134 -binaries: eclipsinginstrumentation: spectrographsThe photometric time series and radial velocities used in this work are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via

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Section: Introductionmentioning

confidence: 99%

The HARPS-N Rocky Planet Search

Motalebi

Udry

Gillon

et al. 2015

A&A

Self Cite

133

101

View full text Add to dashboard Cite

show abstract

“…While waiting for the new generation of ground-and spacebased transit searches targeting bright stars, planet density esti-mates from the follow-up of the Kepler candidates with HARPS-N have already been presented in several papers (Pepe et al 2013;Dumusque et al 2014;Bonomo et al 2014;Dressing et al 2015). They are populating the low-radius regime of the massradius relation for small exoplanets with candidates for which precise mass and radius could be determined.…”

Section: Introductionmentioning

confidence: 99%

The HARPS-N Rocky Planet Search I. HD219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun

Motalebi,

Udry,

Gillon

et al. 2015

Preprint

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We know now from radial-velocity surveys and transit space missions that planets only a few times more massive than our Earth are frequent around solar-type stars. Fundamental questions about their formation history, physical properties, internal structure, and atmosphere composition are, however, still to be solved. We present here the detection of a system of four low-mass planets around the bright (V=5.5) and close-by (6.5 pc) star HD 219134. This is the first result of the Rocky Planet Search program with HARPS-N on the Telescopio Nazionale Galileo in La Palma. The inner planet orbits the star in 3.0937 ± 0.0004 days, on a quasi-circular orbit with a semi-major axis of 0.0382 ±0.0003 AU. Spitzer observations allowed us to detect the transit of the planet in front of the star making HD 219134 b the nearest known transiting planet to date. From the amplitude of the radial-velocity variation (2.33 ± 0.24 ms −1 ) and observed depth of the transit (359 ± 38 ppm), the planet mass and radius are estimated to be 4.46 ± 0.47 M ⊕ and 1.606 ± 0.086 R ⊕ , leading to a mean density of 5.89 ± 1.17 g cm −3 , suggesting a rocky composition. One additional planet with minimum mass of 2.67 ± 0.59 M ⊕ moves on a close-in, quasi-circular orbit with a period of 6.765±0.005 days. The third planet in the system has a period of 46.78 ± 0.16 days and a minimum mass of 8.7 ± 1.1 M ⊕ , at 0.234±0.002 AU from the star. Its eccentricity is 0.32 ± 0.14. The period of this planet is close to the rotational period of the star estimated from variations of activity indicators (42.3 ± 0.1 days). The planetary origin of the signal is, however, the preferred solution as no indication of variation at the corresponding frequency is observed for activity-sensitive parameters. Finally, a fourth additional longer-period planet of mass of 62 ± 6 M ⊕ orbits the star in 1190 days, on an eccentric orbit (e = 0.27 ± 0.11) at a distance of 2.14±0.27 AU.

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Characterization of small planets withKeplerand HARPS-N

Cited by 2 publications

References 7 publications

The HARPS-N Rocky Planet Search

The HARPS-N Rocky Planet Search

The HARPS-N Rocky Planet Search I. HD219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun

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