SIMBAD references

2019AJ....158...87D - Astron. J., 158, 87-87 (2019/August-0)

Characterizing K2 candidate planetary systems orbiting low-mass stars. IV. Updated properties for 86 cool dwarfs observed during Campaigns 1-17.

DRESSING C.D., HARDEGREE-ULLMAN K., SCHLIEDER J.E., NEWTON E.R., VANDERBURG A., FEINSTEIN A.D., DUVVURI G.M., ARNOLD L., BRISTOW M., THACKERAY B., ABRAHAMS E.S., CIARDI D.R., CROSSFIELD I.J.M., YU L., MARTINEZ A.O., CHRISTIANSEN J.L., CREPP J.R. and ISAACSON H.

Abstract (from CDS):

We present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infrared spectra acquired with the NASA Infrared Telescope Facility/SpeX and Palomar/TripleSpec, we found that 86 of our targets were bona fide cool dwarfs, 74 were hotter dwarfs, and 12 were giants. Combining our spectroscopic metallicities with Gaia parallaxes and archival photometry, we derived photometric stellar parameters and compared them to our spectroscopic estimates. Although our spectroscopic and photometric radius and temperature estimates are consistent, our photometric mass estimates are systematically ΔM* = 0.11 M (34%) higher than our spectroscopic mass estimates for the least massive stars (M*,phot < 0.4 M). Adopting the photometric parameters and comparing our results to parameters reported in the Ecliptic Plane Input Catalog, our revised stellar radii are ΔR* = 0.15 R (40%) larger, and our revised stellar effective temperatures are roughly ΔTeff = 65 K cooler. Correctly determining the properties of K2 target stars is essential for characterizing any associated planet candidates, estimating the planet search sensitivity, and calculating planet occurrence rates. Even though Gaia parallaxes have increased the power of photometric surveys, spectroscopic characterization remains essential for determining stellar metallicities and investigating correlations between stellar metallicity and planetary properties.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): planetary systems - stars: fundamental parameters - stars: late-type - stars: low-mass - techniques: photometric - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/AJ/158/87): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Simbad objects: 179

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2021.11.29-23:01:09

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