Results 61 to 70 of about 140,874 (259)
Commissioning an Inexpensive Off‐The‐Shelf Spectrograph for Radial‐Velocity Studies
Astronomische Nachrichten, EarlyView.ABSTRACT We present a way to set up an inexpensive out of the shelf spectrograph at a local observatory. Stability and resolution of the spectrograph are high enough for radial velocity determination of binary stars or determination of stellar characteristics. Even some exoplanets might be detectable via the radial velocity method.
Lukas Stock, Andreas Schrimpf
wiley +1 more source
The Astronomical JournalAtmospheric mass loss is thought to induce the bimodality in the small planet population as we observe it today. Observationally, active mass loss can be traced by excess absorption in spectral lines of lighter species, such as the hydrogen Ly α line and
Ava Morrissey +8 more
doaj +1 more source
The Locus Algorithm IV: Performance metrics of a grid computing system used to create catalogues of optimised pointings [PDF]
, 2020 This paper discusses the requirements for and performance metrics of the the Grid Computing system used to implement the Locus Algorithm to identify optimum pointings for differential photometry of 61,662,376 stars and 23,779 quasars. Initial operational
Creaner, Oisín +3 more
core +1 more source
A Recommendation to Retire VESPA for Exoplanet Validation
Research Notes of the AAS, 2023 VESPA, the first open-source python package built to probabilistically validate exoplanet transit signals, has contributed to the validation of over a thousand exoplanets.
T. Morton, S. Giacalone, S. Bryson
semanticscholar +1 more source
Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) [PDF]
Astronomy & Astrophysics, 2020 Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres.
V. Bourrier +23 more
semanticscholar +1 more source
Searching for Rotational X‐Ray Modulation on TIC 277539431
Astronomische Nachrichten, EarlyView.ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza +2 more
wiley +1 more source
The HD 191939 Exoplanet System is Well Aligned and Flat
The Astronomical JournalWe report the sky-projected spin–orbit angle λ for HD 191939 b, the innermost planet in a six-planet system, using Keck/KPF to detect the Rossiter–McLaughlin (RM) effect.
Jack Lubin +27 more
doaj +1 more source
Advanced Optical Materials, Volume 14, Issue 5, 2 February 2026.A simple and efficient method for determining the stability of optical vortices via Fourier transform using a conventional spherical lens is presented. The theoretical and experimental results demonstrate a practical approach to directly and unambiguously measure the magnitude and sign of the topological charge of a beam without altering an ...
Elena Melnikova +5 more
wiley +1 more source
The Astronomical Journal, 2023 Large-scale exoplanet surveys like the Transiting Exoplanet Survey Satellite (TESS) mission are powerful tools for discovering large numbers of exoplanet candidates.
Christopher R. Mann +50 more
doaj +1 more source
Astrometry of directly imaged exoplanets with optical interferometry
Comptes Rendus. Physique, 2023 Optical interferometry has always been seen as a promising but difficult technique for astronomy. Until the year 2018, it was excrucially limited in sensitivity to magnitudes below 10.
Lacour, Sylvestre
doaj +1 more source