Results 71 to 80 of about 240,676 (167)

TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica

open access: yesThe Astronomical Journal, 2023
We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a full 6.5 hr ...
Melissa J. Hobson   +51 more
doaj   +1 more source

Detection of the temporal variation of the sun's cosmic ray shadow with the IceCube detector [PDF]

open access: yes, 2018
We report on the observation of a deficit in the cosmic ray flux from the directions of the Moon and Sun with five years of data taken by the IceCube Neutrino Observatory.
Aartsen, M. G.   +329 more
core   +5 more sources

A Combined TESS and Ground-based Study of Transit Timing Variations in HAT-P-16, TOI-1516 and TOI-2046 Systems

open access: yesThe Astronomical Journal
We present new results for the hot Jupiters HAT-P-16b, TOI-1516b, and TOI-2046b, based on photometric observations collected using both space- and ground-based facilities.
E. Sonbas   +7 more
doaj   +1 more source

Constraints on time variation of fine structure constant from WMAP-3yr data

open access: yes, 2007
This paper presents the constraints on the time variation of the fine structure constant at recombination relative to its present value, Delta_alpha = (alpha_rec-alpha_0) / alpha_0, obtained from the analysis of the WMAP-3yr Cosmic Microwave Background ...
Stefanescu, Petruta
core   +1 more source

Integrated Study of X-Ray Spectrum and Time Lags for HBL Mrk 421 within the Framework of the Multiple-zone Leptonic Model

open access: yesThe Astrophysical Journal
We present the timing analysis of 10 archived XMM-Newton observations with an exposure of >40 ks of Markarian 421. Mrk 421 is the brightest high-frequency-peaked BL Lac object emitting in X-rays produced by electrons accelerated in the innermost regions ...
Wen Hu   +5 more
doaj   +1 more source

The Colour of the Night Sky

open access: yesJournal of Imaging, 2020
The measurement of night sky quality has become an important task in night sky conservation. Modern measurement techniques involve mainly a calibrated digital camera or a spectroradiometer.
Zoltán Kolláth   +3 more
doaj   +1 more source

Meteor Radar for Investigation of the MLT Region: A Review

open access: yesAtmosphere
This is an introductory review of modern meteor radar and its application to the measurement of the dynamical parameters of the Mesosphere Lower Thermosphere (MLT) Region within the altitude range of around 70 to 110 km, which is where most meteors are ...
Iain M. Reid
doaj   +1 more source

Measuring space-time variation of the fundamental constants with redshifted submillimetre transitions of neutral carbon

open access: yes, 2011
We compare the redshifts of neutral carbon and carbon monoxide in the redshifted sources in which the fine structure transition of neutral carbon, [CI], has been detected, in order to measure space-time variation of the fundamental constants.
A. A. Stark   +83 more
core   +1 more source

Period changes in six contact binaries: WZ And, V803 Aql, DF Hya, PY Lyr, FZ Ori, and AH Tau

open access: yes, 2008
Six contact binaries lacking a period analysis have been chosen to search for the presence of a third body. The O-C diagrams of these binaries were analyzed with the least-squares method by using all available times of minima.
A. Liakos   +50 more
core   +1 more source

Exoplanet Ephemerides Change Observations (ExoEcho). I. Transit Timing Analysis of 37 Exoplanets Using HST/WFC3 Data

open access: yesThe Astronomical Journal
The ExoEcho project is designed to study the photodynamics of exoplanets by leveraging high-precision transit timing data from ground- and space-based telescopes.
Xinyue Ma   +8 more
doaj   +1 more source

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