2020AJ....159...63B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:10:11

2020AJ....159...63B - Astron. J., 159, 63-63 (2020/February-0)

Population-level eccentricity distributions of imaged exoplanets and brown dwarf companions: dynamical evidence for distinct formation channels.

BOWLER B.P., BLUNT S.C. and NIELSEN E.L.

Abstract (from CDS):

The orbital eccentricities of directly imaged exoplanets and brown dwarf companions provide clues about their formation and dynamical histories. We combine new high-contrast imaging observations of substellar companions obtained primarily with Keck/NIRC2 together with astrometry from the literature to test for differences in the population-level eccentricity distributions of 27 long-period giant planets and brown dwarf companions between 5 and 100 au using hierarchical Bayesian modeling. Orbit fits are performed in a uniform manner for companions with short orbital arcs; this typically results in broad constraints for individual eccentricity distributions, but together as an ensemble, these systems provide valuable insight into their collective underlying orbital patterns. The shape of the eccentricity distribution function for our full sample of substellar companions is approximately flat from e = 0-1. When subdivided by companion mass and mass ratio, the underlying distributions for giant planets and brown dwarfs show significant differences. Low mass ratio companions preferentially have low eccentricities, similar to the orbital properties of warm Jupiters found with radial velocities and transits. We interpret this as evidence for in situ formation on largely undisturbed orbits within massive extended disks. Brown dwarf companions exhibit a broad peak at e ≃ 0.6-0.9 with evidence for a dependence on orbital period. This closely resembles the orbital properties and period-eccentricity trends of wide (1-200 au) stellar binaries, suggesting that brown dwarfs in this separation range predominantly form in a similar fashion. We also report evidence that the "eccentricity dichotomy" observed at small separations extends to planets on wide orbits: the mean eccentricity for the multi-planet system HR 8799 is lower than for systems with single planets. In the future, larger samples and continued astrometric orbit monitoring will help establish whether these eccentricity distributions correlate with other parameters such as stellar host mass, multiplicity, and age.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet formation - Brown dwarfs - Extrasolar gas giants

VizieR on-line data: <Available at CDS (J/AJ/159/63): table1.dat table3-5.dat table8.dat refs.dat>

Simbad objects: 73

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Number of rows : 73

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 984b Pl? 00 14 10.2530723028 -07 11 56.814225050           ~ 5 0
2 HD 1160C LM* 00 15 57.2389782387 +04 15 09.090222186           M3.5 11 0
3 HD 1160B LM* 00 15 57.26 +04 15 03.7           ~ 25 0
4 HD 1160 * 00 15 57.3020078544 +04 15 04.004951787   7.159 7.119     A0V 77 1
5 HD 4113C BD* 00 43 12.59 -37 58 57.4           T9 12 0
6 HD 4113 PM* 00 43 12.5956705785 -37 58 57.479407429   8.61 7.88     G5V 70 1
7 HD 4747b Pl? 00 49 26.7612113944 -23 12 44.865754071           ~ 16 0
8 HD 19467B BD* 03 07 18.48 -13 45 43.3           T5.5+1 19 0
9 HD 19467 PM* 03 07 18.5750358835 -13 45 42.419198459   7.65 7.00 7.79 8.82 G3V 125 0
10 RX J0342.5+1216 ** 03 42 31.8233621347 +12 16 22.482517484   16.23   14.44   M5.2V+L0 22 0
11 HD 23514B LM* 03 46 38.26 +22 55 09.4           M8 9 0
12 HD 23514 * 03 46 38.3918639443 +22 55 11.199810774 9.95 9.93 9.43 8.96 8.84 F5V 107 0
13 V* DH Tau Or* 04 29 41.5520056304 +26 32 58.123761109 15.14 14.62 13.10 13.01   M1Ve 264 0
14 V* DH Tau B LM* 04 29 41.66 +26 32 56.5           M9.25 58 1
15 * 51 Eri b Pl 04 37 36.1323118067 -02 28 24.778826936           ~ 103 0
16 * 51 Eri PM* 04 37 36.1323118067 -02 28 24.778826936   5.486 5.209     F0IV 174 0
17 GJ 3305 TT* 04 37 37.4507041928 -02 29 28.869007822   12.04 10.59   8.59 M1.1V 107 0
18 EM* LkCa 15c Pl 04 39 17.7912813350 +22 21 03.387667491           ~ 4 0
19 EM* LkCa 15b Pl 04 39 17.7912813350 +22 21 03.387667491           ~ 63 1
20 EM* LkCa 15d Pl? 04 39 17.7912813350 +22 21 03.387667491           ~ 3 0
21 EM* LkCa 15 Or* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 559 1
22 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3542 0
23 2MASS J04414489+2301513 LM* 04 41 44.8958526354 +23 01 51.407921287       20.6   M8.7 54 1
24 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 352 1
25 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1668 1
26 * bet Pic c Pl 05 47 17.0876901 -51 03 59.441135           ~ 11 0
27 CD-35 2722B BD* 06 09 19.2082646634 -35 49 31.062882043           L0-1 54 0
28 CD-35 2722 ** 06 09 19.2082646634 -35 49 31.062882043   12.61 11.083 10.682 9.337 M1Ve 61 0
29 HD 42581 Er* 06 10 34.6152510171 -21 51 52.658021185 10.801 9.607 8.125 7.164 6.121 M1V 398 0
30 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 463 0
31 HD 49197 PM* 06 49 21.3347532430 +43 45 32.780008859   7.82 7.32     F5 35 0
32 HD 49197B BD* 06 49 21.40 +43 45 33.1           L4 17 0
33 HD 50571B BD* 06 50 00.93 -60 14 56.7           L4-10 9 0
34 HD 50571 PM* 06 50 01.0154778405 -60 14 56.919001147   6.548 6.098 7.26   F5VFe+0.4 56 0
35 HD 76346 ** 08 53 03.7788614388 -56 38 58.137676320   5.982 5.998     A0V 45 0
36 HD 95086b Pl 10 57 03.0216129217 -68 40 02.446874288           ~ 73 1
37 NAME TW Hya Association As* 11 01.9 -34 42           ~ 826 0
38 TWA 42 BD* 11 19 32.54328 -11 37 46.6968           L7 25 0
39 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 118 0
40 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
41 HD 100546c Pl? 11 33 25.4404858122 -70 11 41.239343121           ~ 12 0
42 HD 100546b Pl 11 33 25.4404858122 -70 11 41.239343121           ~ 35 0
43 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 243 0
44 ULAS J130041.74+122114.7 BD* 13 00 42.08415 +12 21 15.0536         23.28 T8.5p 101 0
45 BD+13 2618 Er* 13 00 46.5602816848 +12 22 32.716799085 12.314 11.233 9.750 8.785 7.653 M0V 303 1
46 * e Vir PM* 13 16 46.5161591991 +09 25 26.967205938   5.81   4.8   G0V 504 1
47 * e Vir b Pl 13 16 46.5161591991 +09 25 26.967205938           ~ 82 1
48 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 33 1
49 CD-40 8434c Pl 14 08 10.1545137760 -41 23 52.576649494           ~ 25 0
50 CD-40 8434b Pl 14 08 10.1545137760 -41 23 52.576649494           ~ 55 0
51 CD-40 8434 TT* 14 08 10.1545137760 -41 23 52.576649494   13.42 12.18 11.71 10.506 K7IVe 128 0
52 CD-35 10525B LM* 15 49 12.04 -35 39 05.1           M9-L4 4 0
53 PM J15597+4403B LM* 15 59 46.7971949278 +44 04 01.184216835           M8 4 0
54 PM J15597+4403 PM* 15 59 47.3072237524 +44 03 59.719443588   13.40 11.83 11.35   M2.0V 21 0
55 GSC 06214-00210 TT* 16 21 54.6675132629 -20 43 09.138884434   13.62 12.38 12.11 11.08 M1e 60 0
56 ROXs 12B BD* 16 26 28.05 -25 26 46.0           L0 17 0
57 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 289 0
58 HD 182488B BD* 19 23 34.0126 +33 13 19.078           T9 52 0
59 HD 182488 PM* 19 23 34.0133626629 +33 13 19.074920892       5.8   K0V 246 1
60 * 15 Sge B BD* 20 04 06.2 +17 04 13           L4-5 32 0
61 * 15 Sge PM* 20 04 06.2209062328 +17 04 12.677429047   6.390 5.788 5.4   G0V 339 0
62 HD 206893b Pl? 21 45 21.9056012837 -12 47 00.068065895           ~ 12 0
63 HD 218396c Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 196 1
64 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 178 1
65 HD 218396e Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 132 1
66 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 907 0
67 HD 218396b Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 206 1
68 * kap And PM* 23 40 24.5076320 +44 20 02.156595 3.80 4.06 4.14 4.15 4.22 B9IVn 177 0
69 * kap And B BD* 23 40 24.58 +44 20 02.8           L1 57 0
70 PM J23515+3127 PM* 23 51 33.6739850452 +31 27 23.020837909     13.602 13.105   M2.0V 33 0
71 PM J23515+3127B BD* 23 51 33.9 +31 27 23           L0 8 0
72 NAME AB Dor Moving Group MGr ~ ~           ~ 364 0
73 NAME Psc-Eri Stream St* ~ ~           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:10:11

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