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Research

Research

The bulk of the research carried out at the Peter van de Kamp Observatory during its first few years has been focused on exoplanet transits, in which stars are dimmed by planets passing in front of them. We are participants in two exoplanet collaborations: KELT and YETI which are searching for exoplanets around host stars that are bright and young, respectively. Other projects involve studies of stellar rotation, optical signatures of accretion in young stars, and the winds of massive stars. Students are usually involved in these research projects.

Since its launch in 2018, we have been part of the TESS Follow-Up Network.

Prof. Jensen has written the publicly-available software TAPIR: A Web Interface for Planning Astronomical Observations (ADS), which we, and many others, find very useful for seeing what transits are observable on a given night, making airmass plots for targets, and quite a few other things.

Professors Jensen and Cohen both have active research programs beyond those related to the Peter van de Kamp Observatory, including current projects that involve the acquisition and analysis of data from the ALMA millimeter array in Chile and the Chandra X-ray Observatory.

Below is a list of publications that include data taken at the Peter van de Kamp Observatory.

"KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones," Johns D., et al., Astronomical Journal, 158, 78 (2019)

"The KELT Follow-up Network and Transit False-positive Catalog: Pre-vetted False Positives for TESS," Collins K., et al., Astronomical Journal, 156, 234 (2018)

"KELT-20b: A Giant Planet with a Period of P ~ 3.5 days Transiting the V ~ 7.6 Early A Star HD 185603," Lund M., et al., Astronomical Journal, 154, 194 (2017)

"KELT-18b: Puffy Planet, Hot Host, Probably Perturbed," McLeod K., et al., Astronomical Journal, 153, 263 (2017)

"KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V = 8 Subgiant HD 93396," Pepper J., et al., Astronomical Journal, 153, 215 (2017)

"KELT-12b: A P ~ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star," Stevens D., et al., Astronomical Journal, 153, 178 (2017)

"KELT-17b: A Hot-Jupiter Transiting an A-star in a Misaligned Orbit Detected with Doppler Tomography," Zhou G., et al., Astronomical Journal, 152, 136 (2016)

"Kepler-1647b: The Largest and Longest-period Kepler Transiting Circumbinary Planet," Kostov, V. B., et al., Astrophysical Journal, 827, 86 (2016)

"Stellar Activity and Exclusion of the Outer Planet in the HD 99492 System," Kane S., et al., Astrophysical Journal, 820, 5 (2016)

"On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B," Kane S., et al., Astrophysical Journal, 815, 32 (2015)

"Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems," Seeliger M., et al., Monthly Notices of the Royal Astronomical Society, 451, 4060 (2015)

"KELT-7b: A Hot Jupiter Transiting a Bright V = 8.54 Rapidly Rotating F-star," Bieryla A., et al., Astronomical Journal, 150, 12 (2015)

"Transit timing analysis in the HAT-P-32 system," Seeliger M., et al., Monthly Notices of the Royal Astronomical Society, 441, 304 (2014)

"KELT-6b: A P ~ 7.9 Day Hot Saturn Transiting a Metal-poor Star with a Long-period Companion," Collins K., et al., Astronomical Journal, 147, 39 (2014)

"Constraints on a Second Planet in the WASP-3 System," Maciejewski G., et al., Astronomical Journal, 146, 147 (2013)

"KELT-3b: A Hot Jupiter Transiting a V = 9.8 Late-F Star," Pepper J., et al., Astrophysical Journal, 773, 64 (2013)

"The stellar content of the young open cluster Trumpler 37," Errmann R., et al., Astronomische Nachtrichten, 334, 673 (2013)

"KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a Mid-F Star," Siverd R., et al., Astrophysical Journal, 761, 123 (2012)

"KELT-2Ab: A Hot Jupiter Transiting the Bright (V = 8.77) Primary Star of a Binary System," Beatty T., et al., Astrophysical Journal Letters, 756, L39 (2012)

"The Young Exoplanet Transit Initiative (YETI)," Neuhauser R., et al., Astronomische Nachtrichten, 332, 547 (2011)

Discoveries in the News

Swarthmore Astronomers Aid Discovery of Planet Hotter than Most Stars: “Our KELT team has made a particular contribution in looking at stars that our hotter and more massive than the Sun,” adds Jensen, “and this is our most extreme example yet.”

Swarthmore Astronomers and Students Aid in Discovery of Two New Planets: "There's a lot of work being done right now on studying planets around other stars," Jensen says. "We're looking to make a contribution to that."