THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS

Benjamin J. Fulton, Andrew W. Howard, Lauren M. Weiss, Evan Sinukoff, Erik A. Petigura, Howard Isaacson, Lea Hirsch, Geoffrey W. Marcy, Gregory W. Henry, Samuel K. Grunblatt, Daniel Huber, Kaspar Von Braun, Tabetha S. Boyajian, Stephen R. Kane, Justin Wittrock, Elliott P. Horch, David R. Ciardi, Steve B. Howell, Jason T. Wright, Eric B. Ford

Research output: Contribution to journalArticle

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Abstract

We present the discovery of three modestly irradiated, roughly Neptune-mass planets orbiting three nearby Solartype stars. HD 42618 b has a minimum mass of 15.4±2.4 M, a semimajor axis of 0.55 au, an equilibrium temperature of 337 K, and is the first planet discovered to orbit the solar analogue host star, HD 42618. We also discover new planets orbiting the known exoplanet host stars HD 164922 and HD 143761 (p CrB). The new planet orbiting HD 164922 has a minimum mass of 12.9±1.6 M and orbits interior to the previously known Jovian mass planet orbiting at 2.1 au. HD 164922 c has a semimajor axis of 0.34 au and an equilibrium temperature of 418 K. HD 143761 c orbits with a semimajor axis of 0.44 au, has a minimum mass of 25±2 M, and is the warmest of the three new planets with an equilibrium temperature of 445 K. It orbits exterior to the previously known warm Jupiter in the system. A transit search using space-based CoRoT data and ground-based photometry from the Automated Photometric Telescopes (APTs) at Fairborn Observatory failed to detect any transits, but the precise, high-cadence APT photometry helped to disentangle planetary-reflex motion from stellar activity. These planets were discovered as part of an ongoing radial velocity survey of bright, nearby, chromospherically inactive stars using the Automated Planet Finder (APF) telescope at Lick Observatory. The high-cadence APF data combined with nearly two decades of radial velocity data from Keck Observatory and gives unprecedented sensitivity to both short-period low-mass, and long-period intermediate-mass planets.

Original languageEnglish (US)
Article number46
JournalAstrophysical Journal
Volume830
Issue number1
DOIs
StatePublished - Oct 10 2016

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Neptune (planet)
Neptune
planets
planet
stars
orbits
observatories
observatory
telescopes
transit
radial velocity
photometry
stellar activity
reflexes
temperature
extrasolar planets
Jupiter (planet)
Jupiter
analogs

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fulton, B. J., Howard, A. W., Weiss, L. M., Sinukoff, E., Petigura, E. A., Isaacson, H., ... Ford, E. B. (2016). THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS. Astrophysical Journal, 830(1), [46]. https://doi.org/10.3847/0004-637X/830/1/46
Fulton, Benjamin J. ; Howard, Andrew W. ; Weiss, Lauren M. ; Sinukoff, Evan ; Petigura, Erik A. ; Isaacson, Howard ; Hirsch, Lea ; Marcy, Geoffrey W. ; Henry, Gregory W. ; Grunblatt, Samuel K. ; Huber, Daniel ; Braun, Kaspar Von ; Boyajian, Tabetha S. ; Kane, Stephen R. ; Wittrock, Justin ; Horch, Elliott P. ; Ciardi, David R. ; Howell, Steve B. ; Wright, Jason T. ; Ford, Eric B. / THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS. In: Astrophysical Journal. 2016 ; Vol. 830, No. 1.
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Fulton, BJ, Howard, AW, Weiss, LM, Sinukoff, E, Petigura, EA, Isaacson, H, Hirsch, L, Marcy, GW, Henry, GW, Grunblatt, SK, Huber, D, Braun, KV, Boyajian, TS, Kane, SR, Wittrock, J, Horch, EP, Ciardi, DR, Howell, SB, Wright, JT & Ford, EB 2016, 'THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS', Astrophysical Journal, vol. 830, no. 1, 46. https://doi.org/10.3847/0004-637X/830/1/46

THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS. / Fulton, Benjamin J.; Howard, Andrew W.; Weiss, Lauren M.; Sinukoff, Evan; Petigura, Erik A.; Isaacson, Howard; Hirsch, Lea; Marcy, Geoffrey W.; Henry, Gregory W.; Grunblatt, Samuel K.; Huber, Daniel; Braun, Kaspar Von; Boyajian, Tabetha S.; Kane, Stephen R.; Wittrock, Justin; Horch, Elliott P.; Ciardi, David R.; Howell, Steve B.; Wright, Jason T.; Ford, Eric B.

In: Astrophysical Journal, Vol. 830, No. 1, 46, 10.10.2016.

Research output: Contribution to journalArticle

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AU - Kane, Stephen R.

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Fulton BJ, Howard AW, Weiss LM, Sinukoff E, Petigura EA, Isaacson H et al. THREE TEMPERATE NEPTUNES ORBITING NEARBY STARS. Astrophysical Journal. 2016 Oct 10;830(1). 46. https://doi.org/10.3847/0004-637X/830/1/46