Kepler-4b

A hot neptune-like planet of a g0 star near main-sequence turnoff

William J. Borucki, David G. Koch, Timothy M. Brown, Gibor Basri, Natalie M. Batalha, Douglas A. Caldwell, William D. Cochran, Edward W. Dunham, Thomas N. Gautier, John C. Geary, Ronald Lynn Gilliland, Steve B. Howell, Jon M. Jenkins, David W. Latham, Jack J. Lissauer, Geoffrey W. Marcy, David Monet, Jason F. Rowe, Dimitar Sasselov

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Early time-series photometry from NASA's Kepler spacecraft has revealed a planet transiting the star we term Kepler-4, at R.A. = 19h02 m2768, δ = +50°08′087. The planet has an orbital period of 3.213 days and shows transits with a relative depth of 0.87 × 10-3 and a duration of about 3.95 hr. Radial velocity (RV) measurements from the Keck High Resolution Echelle Spectrometer show a reflex Doppler signal of 9.3+1.1 -1.9 m s-1, consistent with a low-eccentricity orbit with the phase expected from the transits. Various tests show no evidence for any companion star near enough to affect the light curve or the RVs for this system. From a transit-based estimate of the host star's mean density, combined with analysis of high-resolution spectra, we infer that the host star is near turnoff from the main sequence, with estimated mass and radius of 1.223+0.053 -0.091 M and 1.487+0.071 -0.084 R . We estimate the planet mass and radius to be {M P, R P} = {24.5 3.8 M , 3.99 0.21 R }. The planet's density is near 1.9 g cm-3; it is thus slightly denser and more massive than Neptune, but about the same size.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume713
Issue number2 PART 2
DOIs
StatePublished - Jan 1 2010

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Neptune (planet)
Neptune
planets
planet
transit
stars
companion stars
reflexes
radii
high resolution
estimates
eccentricity
velocity measurement
radial velocity
light curve
photometry
spacecraft
spectrometer
spectrometers
time series

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Borucki, W. J., Koch, D. G., Brown, T. M., Basri, G., Batalha, N. M., Caldwell, D. A., ... Sasselov, D. (2010). Kepler-4b: A hot neptune-like planet of a g0 star near main-sequence turnoff. Astrophysical Journal Letters, 713(2 PART 2). https://doi.org/10.1088/2041-8205/713/2/L126
Borucki, William J. ; Koch, David G. ; Brown, Timothy M. ; Basri, Gibor ; Batalha, Natalie M. ; Caldwell, Douglas A. ; Cochran, William D. ; Dunham, Edward W. ; Gautier, Thomas N. ; Geary, John C. ; Gilliland, Ronald Lynn ; Howell, Steve B. ; Jenkins, Jon M. ; Latham, David W. ; Lissauer, Jack J. ; Marcy, Geoffrey W. ; Monet, David ; Rowe, Jason F. ; Sasselov, Dimitar. / Kepler-4b : A hot neptune-like planet of a g0 star near main-sequence turnoff. In: Astrophysical Journal Letters. 2010 ; Vol. 713, No. 2 PART 2.
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Borucki, WJ, Koch, DG, Brown, TM, Basri, G, Batalha, NM, Caldwell, DA, Cochran, WD, Dunham, EW, Gautier, TN, Geary, JC, Gilliland, RL, Howell, SB, Jenkins, JM, Latham, DW, Lissauer, JJ, Marcy, GW, Monet, D, Rowe, JF & Sasselov, D 2010, 'Kepler-4b: A hot neptune-like planet of a g0 star near main-sequence turnoff', Astrophysical Journal Letters, vol. 713, no. 2 PART 2. https://doi.org/10.1088/2041-8205/713/2/L126

Kepler-4b : A hot neptune-like planet of a g0 star near main-sequence turnoff. / Borucki, William J.; Koch, David G.; Brown, Timothy M.; Basri, Gibor; Batalha, Natalie M.; Caldwell, Douglas A.; Cochran, William D.; Dunham, Edward W.; Gautier, Thomas N.; Geary, John C.; Gilliland, Ronald Lynn; Howell, Steve B.; Jenkins, Jon M.; Latham, David W.; Lissauer, Jack J.; Marcy, Geoffrey W.; Monet, David; Rowe, Jason F.; Sasselov, Dimitar.

In: Astrophysical Journal Letters, Vol. 713, No. 2 PART 2, 01.01.2010.

Research output: Contribution to journalArticle

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T2 - A hot neptune-like planet of a g0 star near main-sequence turnoff

AU - Borucki, William J.

AU - Koch, David G.

AU - Brown, Timothy M.

AU - Basri, Gibor

AU - Batalha, Natalie M.

AU - Caldwell, Douglas A.

AU - Cochran, William D.

AU - Dunham, Edward W.

AU - Gautier, Thomas N.

AU - Geary, John C.

AU - Gilliland, Ronald Lynn

AU - Howell, Steve B.

AU - Jenkins, Jon M.

AU - Latham, David W.

AU - Lissauer, Jack J.

AU - Marcy, Geoffrey W.

AU - Monet, David

AU - Rowe, Jason F.

AU - Sasselov, Dimitar

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Early time-series photometry from NASA's Kepler spacecraft has revealed a planet transiting the star we term Kepler-4, at R.A. = 19h02 m2768, δ = +50°08′087. The planet has an orbital period of 3.213 days and shows transits with a relative depth of 0.87 × 10-3 and a duration of about 3.95 hr. Radial velocity (RV) measurements from the Keck High Resolution Echelle Spectrometer show a reflex Doppler signal of 9.3+1.1 -1.9 m s-1, consistent with a low-eccentricity orbit with the phase expected from the transits. Various tests show no evidence for any companion star near enough to affect the light curve or the RVs for this system. From a transit-based estimate of the host star's mean density, combined with analysis of high-resolution spectra, we infer that the host star is near turnoff from the main sequence, with estimated mass and radius of 1.223+0.053 -0.091 M ⊙ and 1.487+0.071 -0.084 R ⊙. We estimate the planet mass and radius to be {M P, R P} = {24.5 3.8 M ⊕, 3.99 0.21 R ⊕}. The planet's density is near 1.9 g cm-3; it is thus slightly denser and more massive than Neptune, but about the same size.

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Borucki WJ, Koch DG, Brown TM, Basri G, Batalha NM, Caldwell DA et al. Kepler-4b: A hot neptune-like planet of a g0 star near main-sequence turnoff. Astrophysical Journal Letters. 2010 Jan 1;713(2 PART 2). https://doi.org/10.1088/2041-8205/713/2/L126