2016A&A...588A.118M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST07:40:29

2016A&A...588A.118M - Astronomy and Astrophysics, volume 588A, 118-118 (2016/4-1)

The GAPS programme with HARPS-N at TNG. XI. Pr 0211 in M 44: the first multi-planet system in an open cluster.

MALAVOLTA L., NASCIMBENI V., PIOTTO G., QUINN S.N., BORSATO L., GRANATA V., BONOMO A.S., MARZARI F., BEDIN L.R., RAINER M., DESIDERA S., LANZA A.F., PORETTI E., SOZZETTI A., WHITE R.J., LATHAM D.W., CUNIAL A., LIBRALATO M., NARDIELLO D., BOCCATO C., CLAUDI R.U., COSENTINO R., COVINO E., GRATTON R., MAGGIO A., MICELA G., MOLINARI E., PAGANO I., SMAREGLIA R., AFFER L., ANDREUZZI G., APARICIO A., BENATTI S., BIGNAMINI A., BORSA F., DAMASSO M., DI FABRIZIO L., HARUTYUNYAN A., ESPOSITO M., FIORENZANO A.F.M., GANDOLFI D., GIACOBBE P., GONZALEZ HERNANDEZ J.I., MALDONADO J., MASIERO S., MOLINARO M., PEDANI M. and SCANDARIATO G.

Abstract (from CDS):

Context. Open cluster (OC) stars share the same age and metallicity, and, in general, their age and mass can be estimated with higher precision than for field stars. For this reason, OCs are considered an importantlaboratory to study the relation between the physical properties of the planets and those of their host stars, and the evolution of planetary systems. However, only a handful of planets have been discovered around OC main-sequence stars so far, all of them in single-planet systems. For this reason we started an observational campaign within the GAPS collaboration to search for and characterize planets in OC.
Aims. We monitored the Praesepe member Pr 0211 to improve our knowledge of the eccentricity of the hot Jupiter (HJ) that is already known to orbit this star and search for additional intermediate-mass planets. An eccentric orbit for the HJ would support a planet-planet scattering process rather than a disk-driven migration after its formation.
Methods. From 2012 to 2015, we collected 70 radial velocity (RV) measurements with HARPS-N and 36 with TRES of Pr 0211. Simultaneous photometric observations were carried out with the robotic STELLA telescope to characterize the stellar activity. We discovered a long-term trend in the RV residuals that we show as being due to the presence of a second, massive, outer planet. Orbital parameters for the two planets are derived by simultaneously fitting RVs and photometric light curves, with the activity signal modelled as a series of sinusoids at the rotational period of the star and its harmonics.
Results. We confirm that Pr 0211b has a nearly circular orbit (e=0.02±0.01), with an improvement of a factor two with respect to the previous determination of its eccentricity, and estimate that Pr 0211c has a mass Mpsini=7.9±0.2MJ, a period P>3500-days and a very eccentric orbit (e>0.60). This kind of peculiar system may be typical of open clusters if the planet-planet scattering phase, which lead to the formation of HJs, is caused by stellar encounters rather than by unstable primordial orbits. Pr 0211 is the first multi-planet system discovered around an OC star.

Abstract Copyright: © ESO, 2016

Journal keyword(s): techniques: radial velocities - techniques: photometric - planetary systems

VizieR on-line data: <Available at CDS (J/A+A/588/A118): table1.dat table3a.dat table3b.dat table4.dat table5.dat>

Nomenclature: [QWL2012] PrNNNNa (No. Pr0211c) added.

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 752 OpC 01 57 41 +37 47.1           ~ 526 0
2 BD+20 518 PM* 03 11 14.2302021896 +21 05 50.492694589   9.26 8.50     G5 89 1
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2581 0
4 HAT-P-13 * 08 39 31.8073600797 +47 21 07.275628863   11.15 10.42 10.40   G4 107 2
5 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1179 0
6 Cl* NGC 2632 JC 278 Ro* 08 42 11.4987998383 +19 16 37.239555467   13.060 12.143     K1V 42 1
7 [QWL2012] Pr0211b Pl 08 42 11.4987998383 +19 16 37.239555467           ~ 11 1
8 [QWL2012] Pr0211c Pl? 08 42 11.4987998383 +19 16 37.239555467           ~ 7 0
9 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1984 0
10 WASP-41 * 12 42 28.4949324021 -30 38 23.527612553   12.36 11.63 11.39 10.78 G8V 35 1
11 HD 187123 PM* 19 46 58.1122608389 +34 25 10.279867125       7.4   G2V 210 1
12 KOI-214 Ro* 19 54 29.9854712037 +48 34 38.801910234           ~ 40 2
13 K2-23 * 22 04 48.7262032385 -12 01 08.000987005     11.9     G9V 90 1
14 HD 217107 ** 22 58 15.5411942071 -02 23 43.387117210   6.919 6.163     G8IV/V 326 1

    Equat.    Gal    SGal    Ecl

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2019.10.24-07:40:29

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