Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type

Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type

Bibliographic Details
Main Author: Hardegree-Ullman, Kevin Karlyle
Language:English
Published: University of Toledo / OhioLINK 2018
Subjects:
Astronomy
Astrophysics
Physics
planet occurrence rates
exoplanets
M dwarfs
stars
stellar spectra
stellar classification
planets
Kepler
Gaia
WIYN
DCT
IRTF
LAMOST
transiting exoplanets
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533214839813619
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-toledo15332148398136192021-08-03T07:07:54Z Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type Hardegree-Ullman, Kevin Karlyle Astronomy Astrophysics Physics planet occurrence rates exoplanets M dwarfs stars stellar spectra stellar classification planets Kepler Gaia WIYN DCT IRTF LAMOST transiting exoplanets Previous studies of planet occurrence rates largely relied on photometric stellar characterizations. We present spectroscopic observations of 337 out of 561 probable mid-type M dwarfs in the primary <i>Kepler</i> field. Our observations have allowed us to constrain spectral type, temperatures, and in some cases metallicities for these stars. We use a random forest classifier to spectral type the remaining 224 targets. Combining our data with <i>Gaia</i> parallaxes, we have computed precise (~3%) stellar radii, which we use to update planet parameters and planet occurrence rates for <i>Kepler</i> mid-type M dwarfs. Within the <i>Kepler</i> field, there are seven M3 V to M5 V stars which host a total of 13 confirmed planets between 0.5 and 2.5 Earth radii and at orbital periods between 0.5 and 10 days. For this population, we compute a planet occurrence rate of 1.27<sup>+0.14</sup><sub>-0.28</sub> planets per star. With our spectral classifications, we compute planet occurrence rates for each spectral sub-type which yields 0.78<sup>+0.53</sup><sub>-0.40</sub>, 1.23<sup>+1.14</sup><sub>-0.75</sub>, and 2.51<sup>+2.87</sup><sub>-1.51</sub> planets per star for M3 V, M4 V, and M5 V, respectively. Our updated planet parameters show Kepler-1649 b to be an Earth sized planet receiving insolation flux similar to Earth. We also use our data to compute stellar mass, identify active stars with Hα emission, and identify binary candidates. Our observations with the multi-object spectrograph Hydra on the WIYN telescope allowed us to observe 1,083 other <i>Kepler</i> stars, which will be useful in future studies. 2018 English text University of Toledo / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533214839813619 http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533214839813619 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Astronomy
Astrophysics
Physics
planet occurrence rates
exoplanets
M dwarfs
stars
stellar spectra
stellar classification
planets
Kepler
Gaia
WIYN
DCT
IRTF
LAMOST
transiting exoplanets
spellingShingle Astronomy
Astrophysics
Physics
planet occurrence rates
exoplanets
M dwarfs
stars
stellar spectra
stellar classification
planets
Kepler
Gaia
WIYN
DCT
IRTF
LAMOST
transiting exoplanets
Hardegree-Ullman, Kevin Karlyle
Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
author Hardegree-Ullman, Kevin Karlyle
author_facet Hardegree-Ullman, Kevin Karlyle
author_sort Hardegree-Ullman, Kevin Karlyle
title Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
title_short Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
title_full Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
title_fullStr Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
title_full_unstemmed Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
title_sort kepler planet occurrence rates for mid-type m dwarfs as a function of spectral type
publisher University of Toledo / OhioLINK
publishDate 2018
url http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533214839813619
work_keys_str_mv AT hardegreeullmankevinkarlyle keplerplanetoccurrenceratesformidtypemdwarfsasafunctionofspectraltype
_version_ 1719454567315275776

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