Diving into light curve datasets

We love exploring the world of ligth curves and finding interesting things, with machine learning and GPUs as our companion. See here for our long-period exoplanets survey/catalog in Kepler data.

Self-lensing binary (SLB) is periodic magnification of a star due to gravitational lensing by a compact star companion, which was predicted by Kip Thorne in 1969. After the serendipitous detection of the first SLB, we performed a systematic survey of SLBs in the {it Kepler} data in international collaboration with Harvard-Smithsonian Center for Astrophysics et al. Using GPU computing, we found four new SLBs (4 in 5 known SLBs were discovered by us). We found that these SLBs, which are a white dwarf and normal star binary, have similar features as field blue stragglers (FBS) and they are likely to be experienced the stable mass transfer due to the Roche lobe overflow. The SLB-FBS connection we found will provide an excellent tests for models of interacting binaries.

References

Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers

Yui Kasagi, Takayuki Kotani, Hajime Kawahara, Tomoyuki Tajiri, Takayuki Muto, Masataka Aizawa, Michiko S. Fujii, Kohei Hattori, Kento Masuda, Munetake Momose, Ryou Ohsawa, Satoshi Takita arXiv:2201.09459, Accepted by ApJS (2022)

Dippers from the TESS Full-Frame Images I: The Results of the first 1 year data and Discovery of A Runaway dipper

Tomoyuki Tajiri, Hajime Kawahara, Masataka Aizawa, Michiko S. Fujii, Kohei Hattori, Yui Kasagi, Takayuki Kotani, Kento Masuda, Munetake Momose, Takayuki Muto, Ryou Ohsawa, Satoshi Takita, ApJS, 251, 2 (2020) arXiv:2009.12830,

Self-lensing Discovery of a 0.2M⊙ White Dwarf in an Unusually Wide Orbit Around a Sun-like Star

Kento Masuda, Hajime Kawahara, David W. Latham, Allyson Bieryla, Masanobu Kunitomo, Morgan MacLeod, Wako Aoki , ApJL 881, 1 (2019), arXiv:1907.07656, AAS NOVA,

Transiting Planets near the Snow Line from Kepler. I. Catalog

Hajime Kawahara, Kento Masuda, AJ 157, 6 (2019), arXiv:1904.04980,

Discovery of Three Self-lensing Binaries from Kepler

Hajime Kawahara, Kento Masuda, Morgan MacLeod, David W. Latham, Allyson Bieryla, Othman Benomar, AJ 155, 144(2018), arXiv:1801.07874,

Transiting Planet Candidates Beyond the Snow Line Detected by Visual Inspection of 7557 Kepler Objects of Interest

Sho Uehara, Hajime Kawahara, Kento Masuda, Shin’ya Yamada, Masataka Aizawa, ApJ, 822, 2 (2016), arXiv:1602.07848,