# Keivan Stassun

Stevenson Professor of Physics | Vanderbilt University

Nashville, TN, UNITED STATES

Expert in the search for Earth-like planets across the galaxy and an advocate for diversity, including neurodiversity, in the academy.

2018

2018

2018

2017

2015

## Selected Media Appearances (5)

#### “Six Light-Years Away”–TESS Exoplanet Team Will Observe 400,000 Stars

The Daily Galaxy  online

2019-03-26

“This is a remarkable time in human history and a huge leap for our understanding of our place in the universe,” said astronomer Keivan Stassun of Vanderbilt University, a member of the TESS science team that will observe 400,000 stars across the whole sky to catch a glimpse of an exoplanet transiting across the face of its star. The stars selected are bright, cool dwarfs, with temperatures roughly between 2,700 and 5,000 degrees Kelvin. The closest are only approximately 6 light-years from Earth.

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#### De-emphasize GREs, look broadly for new Ph.D. students: expert

Cornell Chronicle  online

2018-10-10

“The fact is, there are a lot of people lining up and paying good money to take these exams, presumably not for the fun of it, presumably because they’re at least contemplating going to graduate school,” Stassun said. In addition to overlooked students, “There really are lots of students who don’t even bother applying because they see the outcomes of their GRE scores and they think they know what that implies for their chances. And, unfortunately, in many cases, they’re probably right.”

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#### Super hot planet bigger than Jupiter might be disappearing

CNET  online

2017-06-05

"KELT-9 radiates so much ultraviolet radiation that it may completely evaporate the planet," Vanderbilt's Keivan Stassun said in a release. "Or, if gas giant planets like KELT-9b possess solid rocky cores as some theories suggest, the planet may be boiled down to a barren rock, like Mercury." The team has published a paper describing the planet in the journal Nature and is also presenting it this week at a meeting of American Astronomical Society in Austin.

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#### Flawed Data Just Made That 'Alien Megastructure' Even More Unlikely

Gizmodo  online

2016-05-09

“Whenever you are doing archival research that combines information from a number of different sources, there are bound to be data precision limits that you must take into account,” explained study co-author Keivan Stassun in a statement. “In this case, we looked at variations in the brightness of a number of comparable stars in the DASCH database and found that many of them experienced a similar drop in intensity in the 1960’s. That indicates the drops were caused by changes in the instrumentation not by changes in the stars’ brightness.”

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#### A Graduate Program Works To Diversify The Science World

NPR  online

2014-01-02

"For too long we've thought about diversity as this problem sort of after the fact," says Keivan Stassun, an astronomy professor at Vanderbilt University. Stassun helped found the Bridge Program — a partnership between Vanderbilt and nearby Fisk, a historically black university — which was created in 2004 with the goal of increasing the numbers of women and underrepresented minority students earning Ph.D.s in science. "In reality," Stassun says, "the diversity is there, and we've been seriously filtering it out. And we've been filtering it out on the basis of things that are not actually predictive of who's going to succeed and who's going to fail." Those things are, mostly, GRE scores and GPA.

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## Selected Articles (3)

The Astrophysical Journal

Karl Jaehnig, Garrett Somers, Keivan G Stassun

2019 Radius inflation continues to be explored as a peculiar occurrence among magnetically active, low-mass stars. Recently, Somers & Stassun showed that radius inflation among low-mass stars in the young open cluster M45 (Pleiades Cluster) is correlated to the rotation rate: faster rotators are more inflated.

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#### On the Gaia DR2 distances for Galactic luminous blue variables

Monthly Notices of the Royal Astronomical Society

Nathan Smith, Mojgan Aghakhanloo, Jeremiah W Murphy, Maria R Drout, Keivan G Stassun, Jose H Groh

2019 We examine parallaxes and distances for Galactic luminous blue variables (LBVs) in the Gaia second data release (DR2). The sample includes 11 LBVs and 14 LBV candidates. For about half of the sample, DR2 distances are either similar to commonly adopted literature values, or the DR2 values have large uncertainties.

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#### TOI-150: A transiting hot Jupiter in the TESS southern CVZ

The Astrophysical Journal Letters

Caleb I Cañas, Gudmundur Stefansson, Andrew J Monson, Johanna K Teske, Chad F Bender, Suvrath Mahadevan, Conny Aerts, Rachael L Beaton, R Paul Butler, Kevin R Covey, Jeffrey D Crane, Nathan De Lee, Matias R Diaz, Scott W Fleming, DA Garcia-Hernandez, Fred R Hearty, Juna A Kollmeier, Steven R Majewski, Christian Nitschelm, Donald P Schneider, Stephen A Shectman, Keivan G Stassun, Andrew Tkachenko, Sharon X Wang, Songhu Wang, John C Wilson, Robert F Wilson

2019 We report the detection of a hot Jupiter (${M}_{p}={1.75}_{-0.17}^{+0.14}\,{M}_{{\rm{J}}}$, R p = 1.38 ± 0.04 R J) orbiting a middle-aged star ($\mathrm{log}g={4.152}_{-0.043}^{+0.030}$) in the Transiting Exoplanet Survey Satellite (TESS) southern continuous viewing zone (β = −79fdg59).

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