Search Publications
Eclipse Timings of the LMXB XTE J1710-281 : discovery of a third orbital period glitch
Paul, Biswajit; Jain, Chetana; Sharma, Rahul
We present an updated measurement of orbital period evolution of LMXB XTE J1710-281 by using eclipse timing technique. Using data obtained with XMM-Newton, Suzaku, RXTE, Chandra, and AstroSat observatories, we report 21 new measurements of X-ray mid-eclipse times. We have discovered a third orbital period glitch in XTE J1710-281 with an F-test fal…
The CO Emission in the Taffy Galaxies (UGC 12914/15) at 60 pc Resolution. I. The Battle for Star Formation in the Turbulent Taffy Bridge
Boulanger, F.; Falgarone, E.; Braine, J. +8 more
We present Atacama Large Millimeter/submillimeter Array observations at a spatial resolution of 0.″2 (60 pc) of CO emission from the Taffy galaxies (UGC 12914/5). The observations are compared with narrowband Paα, mid-IR, radio continuum and X-ray imaging, plus optical spectroscopy. The galaxies have undergone a recent head-on collision, creating …
High-resolution images of two wiggling stellar jets, MHO 1502 and MHO 2147, obtained with GSAOI+GeMS
Gómez, M.; Saldaño, H. P.; Kalari, V. M. +3 more
Aims: We investigated the possible cause-effect relation between the wiggling shape of two stellar jets, MHO 1502 and MHO 2147, and the potential binarity of the respective driving stars.
Methods: We present high-angular-resolution H2 (2.122 µm) and K-band images obtained with the Gemini South Adaptive Optics Imager (GSA…
CoRoT-TESS eclipsing binaries with light-travel-time effect
Bódi, A.; Hajdu, T.; Matécsa, B. +1 more
Identifying long-period eclipsing binaries with space-based photometry is still a challenge even in the century of space telescopes due to the relatively short observation sequences and short lifetime of these missions. The Transiting Exoplanet Survey Satellite (TESS) space telescope is an appropriate tool to supplement previous space-based observ…
Constraining energy-dependent emissivity profiles of AGN inflows
Middleton, Matthew J.; Ashton, Dominic I.
The emissivity of the accretion flow is a key parameter affecting the shape of both the energy and variability power spectra of active galactic nuclei (AGNs). We explore the energy dependence of the power spectrum for five AGNs, across the XMM-Newton bandpass, and across the 0.01-1 mHz frequency range, finding a ubiquitous flattening of the power …
Optical observations of star clusters NGC 1513 and NGC 4147; white dwarf WD 1145+
Yadav, R. K. S.; Pandey, S. B.; Sharma, Saurabh +3 more
The UBVRI CCD photometric data of open star cluster NGC 1513 are obtained with the 3.6-m Indo-Belgian Devasthal optical telescope (DOT). Analyses of the GAIA EDR3 astrometric data have identified 106 possible cluster members. The mean proper motion of the cluster is estimated as
High-resolution DTM-based estimation of geomorphometric parameters of selected putative martian scoria cones
Székely, Balázs; Vörös, Fanni
Some previous studies have identified a number of features on Mars that are thought to be scoria cones. Since (terrestrial) scoria cones have special significance that they are monogenetic volcanoes, i.e. the volcanic edifice is created by a single eruptive event. The process usually produces fairly symmetrical cones, making them a target for morp…
Variation of ionospheric plasma density during the annular solar eclipse on December 26, 2019
Palit, Sourav; Kundu, Subrata; Chowdhury, Swati +2 more
The annular solar eclipse of the previous decade that occurred on December 26, 2019, was mostly visible from most Asian countries, including India. In this manuscript, we present the variation of ionospheric plasma density profiles at different heights during the eclipse and non-eclipse days. We use both the ground- and space-based instruments to …
Variability of Jupiter's Main Auroral Emission and Satellite Footprints Observed With HST During the Galileo Era
Clarke, John T.; Moore, Luke; Bonfond, Bertrand +3 more
Hubble Space Telescope images of Jupiter's UV aurora show that the main emission occasionally contracts or expands, shifting toward or away from the magnetic pole by several degrees in response to changes in the solar wind dynamic pressure and Io's volcanic activity. When the auroral footprints of the Galilean satellites move with the main emissio…
Follow‑up observations of the binary system γ Cep
Mugrauer, Markus; Buder, Sven; Ginski, Christian +2 more
We present new imaging and spectroscopic observations of the exoplanet host star $\gamma$ Cep A, and of its low-mass stellar companion $\gamma$ Cep B. We used AstraLux/CAHA to follow the orbital motion of the companion around its primary, whose radial velocity was determined with spectra of the star, taken with the spectrograph FLECHAS at the Univ…