TY - JOUR
T1 - The Anglo-Australian Planet Search. XXV. A candidate massive Saturn analog orbiting HD 30177
AU - Wittenmyer, Robert A.
AU - Horner, Jonathan
AU - Mengel, M. W.
AU - Butler, R. P.
AU - Wright, D. J.
AU - Tinney, C. G.
AU - Carter, B. D.
AU - Jones, H. R. A.
AU - Anglada-Escudé, G.
AU - Bailey, J.
AU - O'Toole, Simon J.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - We report the discovery of a second long-period giant planet orbiting HD 30177, a star previously known to host a massive Jupiter analog (HD 30177b: a = 3.8 ±0.1 au, m sin i = 9.7 ±0.5 M Jup). HD 30177c can be regarded as a massive Saturn analog in this system, with a = 9.9 ±1.0 au and m sin i = 7.6 ±3.1 M Jup. The formal best-fit solution slightly favors a closer-in planet at a ∼ 7 au, but detailed n-body dynamical simulations show that configuration to be unstable. A shallow local minimum of longer period, lower eccentricity solutions was found to be dynamically stable, and hence we adopt the longer period in this work. The proposed ∼32 year orbit remains incomplete; further monitoring of this and other stars is necessary to reveal the population of distant gas giant planets with orbital separations a ∼ 10 au, analogous to that of Saturn.
AB - We report the discovery of a second long-period giant planet orbiting HD 30177, a star previously known to host a massive Jupiter analog (HD 30177b: a = 3.8 ±0.1 au, m sin i = 9.7 ±0.5 M Jup). HD 30177c can be regarded as a massive Saturn analog in this system, with a = 9.9 ±1.0 au and m sin i = 7.6 ±3.1 M Jup. The formal best-fit solution slightly favors a closer-in planet at a ∼ 7 au, but detailed n-body dynamical simulations show that configuration to be unstable. A shallow local minimum of longer period, lower eccentricity solutions was found to be dynamically stable, and hence we adopt the longer period in this work. The proposed ∼32 year orbit remains incomplete; further monitoring of this and other stars is necessary to reveal the population of distant gas giant planets with orbital separations a ∼ 10 au, analogous to that of Saturn.
KW - planetary systems
KW - stars: individual (HD 30177)
KW - techniques: radial velocities
UR - http://www.scopus.com/inward/record.url?scp=85017394571&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP0774000
UR - http://purl.org/au-research/grants/arc/DP130102695
U2 - 10.3847/1538-3881/aa5f17
DO - 10.3847/1538-3881/aa5f17
M3 - Article
SN - 0004-6256
VL - 153
SP - 1
EP - 12
JO - The Astronomical Journal
JF - The Astronomical Journal
IS - 4
M1 - 167
ER -