2019A&A...630A..50B


Query : 2019A&A...630A..50B

2019A&A...630A..50B - Astronomy and Astrophysics, volume 630A, 50-50 (2019/10-1)

Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars.

BOEHLE A., QUANZ S.P., LOVIS C., SEGRANSAN D., UDRY S. and APAI D.

Abstract (from CDS):


Context. Nearby stars are prime targets for exoplanet searches and characterization using a variety of detection techniques. Combining constraints from the complementary detection methods of high-contrast imaging (HCI) and radial velocity (RV) can further constrain the planetary architectures of these systems because these methods place limits at different regions of the companion mass and semi-major axis parameter space. Compiling a census of the planet population in the solar neighborhood is important to inform target lists for future space missions that will specifically target nearby stars to search for Earth analogs.
Aims. We aim to constrain the planetary architectures from the combination of HCI and RV data for six nearby stars within 6pc: τ Ceti, Kapteyn's star, AX Mic, 40 Eri, HD 36395, and HD 42581. We explored where HCI adds information to constraints from the long-term RV monitoring data for these stars.
Methods. We compiled the sample from stars with available archival VLT/NACO HCI data at L' band (3.8µm), where we expect substellar companions to be brighter for the typically older ages of nearby field stars (>1Gyr). The NACO data were fully reanalyzed using the state-of-the-art direct imaging pipeline PynPoint and combined with RV data from HARPS, Keck/HIRES, and CORALIE. A Monte Carlo approach was used to assess the completeness in the companion mass and semi-major axis parameter space from the combination of the HCI and RV data sets.
Results. We find that the HCI data add significant information to the RV constraints, increasing the completeness for certain companions masses and semi-major axes by up to 68-99% for four of the six stars in our sample, and by up to 1-13% for the remaining stars. The improvements are strongest for intermediate semi-major axes (15-40AU), corresponding to the semi-major axes of the ice giants in our own solar system. The HCI mass limits reach 5-20MJup in the background-limited regime, depending on the age of the star.
Conclusions. Through the combination of HCI and RV data, we find that stringent constraints can be placed on the possible substellar companions in these systems. Applying these methods systematically to nearby stars will quantify our current knowledge of the planet population in the solar neighborhood and inform future observations.

Abstract Copyright: © ESO 2019

Journal keyword(s): techniques: high angular resolution - planets and satellites: general - infrared: planetary systems - solar neighborhood - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/630/A50): stars.dat table.dat>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1197 1
2 * omi02 Eri Er* 04 15 16.3196189945 -07 39 10.330779018 5.69 5.25 4.43 3.74 3.29 K0V 787 0
3 HD 33793 PM* 05 11 40.5898395497 -45 01 06.361734876 11.624 10.433 8.853 7.9 6.899 M1VIp 316 0
4 HD 36395 PM* 05 31 27.3957852161 -03 40 38.024004501 10.626 9.443 7.968 6.996 5.913 M1.5Ve 484 0
5 HD 42581 Er* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 447 0
6 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 488 0
7 V* AX Mic Er* 21 17 15.2690680973 -38 52 02.503938581   8.09 6.68     M1V 215 0
8 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1057 0

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2023.01.26-23:32:03

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