Results 1 to 10 of about 532,841 (292)
A HOT HORIZONTAL BRANCH STAR WITH A CLOSE K-TYPE MAIN-SEQUENCE COMPANION [PDF]
The Astrophysical Journal, 2015 Dynamical interactions in binary systems are thought to play a major role in the formation of extreme horizontal branch stars (EHBs) in the Galactic field. However, it is still unclear if the same mechanisms are at work in globular clusters, where EHBs are predominantly single stars.
Sandro Villanova +7 more
core +11 more sources
Exoplanet Aeronomy: A Case Study of WASP-69 b’s Variable Thermosphere [PDF]
The Astronomical JournalAeronomy, the study of Earth’s upper atmosphere and its interaction with the local space environment, has long traced changes in the thermospheres of Earth and other solar system planets to solar variability in the X-ray and extreme-ultraviolet ...
W. Garrett Levine +7 more
doaj +2 more sources
The Astronomical JournalGiant planets exhibit diverse orbital properties, hinting at their distinct formation and dynamic histories. In this paper, using Gaia Data Release 3 (DR3), we investigate if and how the orbital properties of Jupiters are linked to their host star ...
Bihan Banerjee +7 more
doaj +2 more sources
Probable detection of an eruptive filament from a superflare on a solar-type star [PDF]
Nature Astronomy, 2021 Solar flares are often accompanied by filament/prominence eruptions (~10 4 K and ~10 10−11 cm −3 ), sometimes leading to coronal mass ejections that directly affect the Earth’s environment 1 , 2 .
K. Namekata +22 more
semanticscholar +2 more sources
Main Sequence Star Super-flare Frequency based on Entire Kepler Data [PDF]
Research in Astronomy and Astrophysics, 2022 We wrote and used an automated flare detection Python script to search for super-flares on main sequence stars of types A, F, G, K and M in Kepler’s long-cadence data from Q0 to Q17.
A. Althukair, D. Tsiklauri
semanticscholar +1 more source
HD133729: A blue large-amplitude pulsator in orbit around a main-sequence B-type star [PDF]
Astronomy & Astrophysics, 2022 Blue large-amplitude pulsators (BLAPs) form a small group of hot objects pulsating in a fundamental radial mode with periods of the order of 30 minutes.
A. Pigulski +2 more
semanticscholar +1 more source
HD 56414 b: A Warm Neptune Transiting an A-type Star [PDF]
Astrophysical Journal Letters, 2022 We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R p = 3.71 ± 0.20 R ⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing
S. Giacalone +19 more
semanticscholar +1 more source
Highly Structured Inner Planetary System Debris around the Intermediate Age Sun-like Star TYC 8830 410 1 [PDF]
Astrophysical Journal, 2021 We present a detailed characterization of the extremely dusty main-sequence star TYC 8830 410 1. This system hosts inner planetary system dust (T dust ≈ 300 K) with a fractional infrared luminosity of ∼1%.
C. Melis +6 more
semanticscholar +1 more source
The Astrophysical Journal Letters, 2023 ASASSN-V J205543.90+240033.5 (ASJ2055) is a possible post-common-envelope binary system. Its optical photometric data show an orbital variation of about 0.52 days and a fast period modulation of P _0 ∼ 9.77 minutes, whose origin is unknown.
J. Takata +9 more
doaj +1 more source
Coronal and Chromospheric Emission in A-type Stars [PDF]
Astronomical Journal, 2022 Cool stars on the main sequence generate X-rays from coronal activity, powered by a convective dynamo. With increasing temperature, the convective envelope becomes smaller and X-ray emission fainter.
H. M. Günther +5 more
semanticscholar +1 more source