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Ongoing, extreme-precision Doppler radial velocity surveys seek planets with masses less than several M$_\oplus$; population-level studies to determine the distribution of planetary masses, however, remain difficult due to the required…

Earth and Planetary Astrophysics · Physics 2022-04-20 Samuel H. C. Cabot , Gregory Laughlin

We present results from an all-sky search for unmodeled gravitational-wave bursts in the data collected by the LIGO, GEO 600 and Virgo detectors between November 2006 and October 2007. The search is performed by three different analysis…

General Relativity and Quantum Cosmology · Physics 2012-08-27 The LIGO Scientific Collaboration , the Virgo Collaboration

We perform a blind search for the variability of the gamma-ray sky in the energy range E>1 GeV using 308 weeks of the Fermi-LAT data. We use the technique based on the comparison of the weekly photon counts and exposures in sky pixels by…

High Energy Astrophysical Phenomena · Physics 2015-12-22 M. S. Pshirkov , G. I. Rubtsov

We present high sensitivity polarimetric observations in 6 bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia…

We describe an ongoing variable star search program and present the first reduced results of a search in a 19 square degree (4.4\circle x 4.4\circle) field centered on J2000 {\alpha} = 22:03:24, {\delta} = +18:54:32. The search was carried…

Astrophysics of Galaxies · Physics 2011-02-01 Michael D. Williams , E. F. Milone

We present preliminary results on a global study of X-ray binaries using 14 Ms of data from the Rossi X-ray Timing Explorer satellite. Our initial study on GX 339-4 is recapped as an introduction to the methods used. We use a consistent…

Astrophysics · Physics 2009-06-25 Robert Dunn , Rob Fender , Elmar Koerding , Clement Cabanac , Tomaso Belloni

We present the results of our identification of 11 X-ray sources detected on the half of the sky $0^\circ<l<180^\circ$ in the 4-12 keV energy band on the combined map of the first five all-sky surveys with the Mikhail Pavlinsky ART-XC…

The most recent all-sky surveys performed with the INTEGRAL and SWIFT satellites allowed the detection of more than 1500 sources in hard X-rays above 20 keV. About one quarter of them has no obvious counterpart at other wavelengths and…

We use all COMPTEL data from the beginning of the CGRO mission (April '91) up to the end of CGRO Cycle 6 (November '97) to carry out all-sky point source analyses in the four standard COMPTEL energy bands for different time periods. We…

Astrophysics · Physics 2009-10-31 W. Collmar , V. Schoenfelder , A. W. Strong , H. Bloemen , W. Hermsen , M. McConnell , J. Ryan , K. Bennett

We report on the full analysis of a Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring of the {\gamma}-ray binary system LS I +61 303. The data set covers 42 contiguous cycles of the system orbital motion.…

High Energy Astrophysical Phenomena · Physics 2015-05-27 Jian Li , Diego F. Torres , Shu Zhang , Yupeng Chen , Daniela Hadasch , Paul S. Ray , Peter Kretschmar , Nanda Rea , Jianmin Wang

The Pan-STARRS 3$\pi$ survey has detected hundreds of thousands of variable stars thanks to its coverage and 4-year time span, even though the sampling of the light curves is relatively sparse. These light curves contain only 10-15…

Solar and Stellar Astrophysics · Physics 2024-08-27 Adrienn Forró , László Molnár , Emese Plachy , Áron Juhász , Róbert Szabó

A search is made for periodic modulation in the X-ray flux from the low mass X-ray binary GX13+1 using Rossi X-ray Timing Explorer All Sky Monitor data collected over a period of almost seven years. From a filtered data set, which excludes…

Astrophysics · Physics 2009-11-07 Robin H. D. Corbet

We report on long-term monitoring of anomalous X-ray pulsars (AXPs) using the Rossi X-ray Timing Explorer. Using phase-coherent timing, we find a wide variety of behaviors among the sources, ranging from high stability (in 1E 2259.1+586 and…

Astrophysics · Physics 2009-09-25 Fotis P. Gavriil , Victoria M. Kaspi , Deepto Chakrabarty

Our paper presents new methods for finding and testing of weak periodic variability of stellar objects developed for the purpose of detecting expected regular light variations of magnetic chemically peculiar (mCP) candidates in the Large…

Instrumentation and Methods for Astrophysics · Physics 2015-03-20 Zdenek Mikulasek , Ernst Paunzen , Martin Netopil , Miloslav Zejda

The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (${\sim}4$ yrs) $V-$band light curves for sources brighter than V$\lesssim17$ mag across the whole sky. We produced V-band light curves for a total of ${\sim}61.5$…

The reliability of detecting source variability in sparsely and irregularly sampled X-ray light curves is investigated. This is motivated by the unprecedented survey capabilities of eROSITA onboard SRG, providing light curves for many…

High Energy Astrophysical Phenomena · Physics 2022-05-18 Johannes Buchner , Thomas Boller , David Bogensberger , Adam Malyali , Kirpal Nandra , Joern Wilms , Tom Dwelly , Teng Liu

Theory predicts that a supermassive black hole binary (SMBHB) could be observed as a luminous active galactic nucleus (AGN) that periodically varies on the order of its orbital timescale. In X-rays, periodic variations could be caused by…

The sky is full of variable and transient sources on all time scales, from milliseconds to decades. Planck's regular scanning strategy makes it an ideal instrument to search for variable sky signals in the millimetre and submillimetre…

Instrumentation and Methods for Astrophysics · Physics 2015-12-14 Jörg P. Rachen , Elina Keihänen , Martin Reinecke

The time-series component of WISE is a valuable resource for the study of variable objects. We present an analysis of an all-sky sample of ~450,000 AllWISE+NEOWISE infrared light curves of likely variables identified in AllWISE. By…

Solar and Stellar Astrophysics · Physics 2021-04-06 Evan Petrosky , Hsiang-Chih Hwang , Nadia L. Zakamska , Vedant Chandra , Matthew J. Hill

We analyzed 11 epochs of archival Atacama Large Millimeter/submillimeter Array (ALMA) data to investigate flux density variability of Sgr A* at 340 GHz. In one epoch, the light curve exhibits two short-timescale components with…

High Energy Astrophysical Phenomena · Physics 2026-05-13 Kazuki Yanagisawa , Tomoharu Oka , Tatsuya Kotani , Ryo Ariyama , Kazuki Yanagihara , Yuhei Iwata