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New insights on stellar evolution and stellar interiors physics are being made possible by asteroseismology. Throughout the course of the Kepler mission, asteroseismology has also played an important role in the characterization of…

Microlensing is one of the most powerful methods that can detect extrasolar planets and a future space-based survey with a high monitoring frequency is proposed to detect a large sample of Earth-mass planets. In this paper, we examine the…

Astrophysics · Physics 2009-11-11 Byeong-Gon Park , Young-Beom Jeon , Chung-Uk Lee , Cheongho Han

We present results of a continuation of our Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed during Years 2 and 4 of the TESS mission that targeted the northern ecliptic…

Solar and Stellar Astrophysics · Physics 2024-03-06 A. S. Baran , S. Charpinet , R. H. Østensen , M. D. Reed , V. Van Grootel , C. Lyu , J. H. Telting , P. Németh

According to activity-rotation relations, rapid rotators are expected to show high levels of magnetic activity. However, recent studies with TESS have found Ultra Fast Rotating (UFR) M dwarfs with periods $<1$ d displaying low levels of…

Solar and Stellar Astrophysics · Physics 2026-04-10 Lauren Doyle , George W. King , Gavin Ramsay , Lía R. Corrales , Stefano Bagnulo , J. Gerry Doyle , Pasi Hakala

One important strength of the microlensing method in detecting extrasolar planets is its high sensitivity to low-mass planets. However, it is often believed that microlensing detections of Earth-mass planets from ground-based observation…

Earth and Planetary Astrophysics · Physics 2015-06-19 Youn Kil Jung , Hyuk Park , Cheongho Han , Kyu-Ha Hwang , In-Gu Shin , Joon-Young Choi

Microlensing has proven to be a valuable tool to search for extrasolar planets of Jovian- to Super-Earth-mass planets at orbits of a few AU. Since planetary signals are of very short duration, an intense and continuous monitoring is…

Astrophysics · Physics 2009-11-13 Arnaud Cassan , Takahiro Sumi , Daniel Kubas

Gravitational microlensing events of high magnification provide exceptional sensitivity to the presence of low-mass planets orbiting the lens star, including planets with masses as low as that of Earth. The essential requirement for the…

Astrophysics · Physics 2008-05-14 Philip Yock

To date, a handful of exoplanets have been photometrically mapped using phase-modulated reflection or emission from their surfaces, but the small amplitudes of such signals have limited previous maps almost exclusively to coarse dipolar…

Earth and Planetary Astrophysics · Physics 2019-04-01 Rodrigo Luger , Megan Bedell , Roland Vanderspek , Christopher J. Burke

We present an analysis of a volume-complete sample of 363 mid-to-late M dwarfs within 15 pc of the Sun with masses between 0.1 and 0.3 M$_\odot$ observed by TESS within Observation Sectors 1 to 42. The median mass of the stars in this…

Earth and Planetary Astrophysics · Physics 2023-06-06 Kristo Ment , David Charbonneau

We classify various types of planetary lensing signals and the channels of detecting them. We estimate the relative frequencies of planet detections through the individual channels with special emphasis on the new channels to be…

Astrophysics · Physics 2009-11-13 Cheongho Han

Current microlensing surveys are sensitive to free-floating planets down to Earth-mass objects. All published microlensing events attributed to unbound planets were identified based on their short timescale (below two days), but lacked an…

Microlensing has a unique advantage for detecting dark objects in the Milky Way, such as free-floating planets, neutron stars, and stellar-mass black holes. Most microlensing surveys focus on the Galactic bulge, where higher stellar density…

Astrophysics of Galaxies · Physics 2024-11-11 Ruocheng Zhai , Antonio C. Rodriguez , Shude Mao , Casey Y. Lam , Eric C. Bellm , Josiah Purdum , Frank J. Masci , Avery Wold

The upcoming TESS mission is expected to find thousands of transiting planets around bright stars, yet for three-quarters of the fields observed the temporal coverage will limit discoveries to planets with orbital periods below 13.7 days.…

Instrumentation and Methods for Astrophysics · Physics 2017-01-25 David M. Kipping , Christopher Lam

Roman microlensing stands at a crossroads between its originally charted path of cataloging a population of cool planets that has subsequently become well-measured down to super-Earths, and the path of free-floating planets (FFPs), which…

Earth and Planetary Astrophysics · Physics 2024-07-19 Andrew Gould , Jennifer C. Yee , Subo Dong

The Microlensing Planet Finder (MPF) is a proposed Discovery mission that will complete the first census of extrasolar planets with sensitivity to planets like those in our own solar system. MPF will employ a 1.1m aperture telescope, which…

[abridged] WFIRST is uniquely capable of finding planets with masses as small as Mars at separations comparable to Jupiter, i.e., beyond the current ice lines of their stars. These planets fall between the close-in planets found by Kepler…

Even though the recently discovered high-magnification event MOA-2010-BLG-311 had complete coverage over the peak, confident planet detection did not happen due to extremely weak central perturbations (fractional deviations of $\lesssim…

Earth and Planetary Astrophysics · Physics 2015-06-19 Sun-Ju Chung , Chung-Uk Lee , Jae-Rim Koo

The search for planets orbiting other stars has recently expanded to include stars from galaxies outside the Milky Way. With the TESS and Gaia surveys, photometric and kinematic information can be combined to identify transiting planet…

Earth and Planetary Astrophysics · Physics 2022-09-07 Stephanie Yoshida , Samuel Grunblatt , Adrian Price-Whelan

Most flares on the Sun occur at random, but there is a small percentage of "sympathetic flaring" -- the triggering of one flare by another. Previously there had been no widespread confirmation of sympathetic flares on other stars. In this…

Solar and Stellar Astrophysics · Physics 2026-02-25 Veronica Pratt , Jason R. Reeves , David V. Martin , Andy B. Zhang , Andrew Korkus , S. Edelman