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Insights into the subsurface structure of wrinkle ridges on Mars
Karagoz, Oguzcan; Kenkmann, Thomas; Wulf, Gerwin
Wrinkle ridges are important landforms on Mars and other planetary bodies and result from horizontal tectonic shortening. This study provides insights into the subsurface of selected wrinkle ridge sites, based on exposures provided by steep escarpments and crater slopes that crosscut wrinkle ridges. We mapped the complex fold and fault patterns an…
Rapid early gas accretion for the inner Galactic disc. A case for a short accretion timescale
Khoperskov, Sergey; Di Matteo, Paola; Katz, David +3 more
Context. Recent observations of the Milky Way and galaxies at high redshifts suggest that galaxy discs were already in place soon after the Big Bang. While the gas infall history of the Milky Way in the inner disc has long been assumed to be characterised by a short accretion timescale, this has not been directly constrained using observations.
Dayside magnetopause reconnection and flux transfer events under radial interplanetary magnetic field (IMF): BepiColombo Earth-flyby observations
Trattner, Karlheinz J.; Saito, Yoshifumi; Zong, Qiu-Gang +8 more
This study analyzes the flux transfer event (FTE)-type flux ropes and magnetic reconnection around the dayside magnetopause during BepiColombo's Earth flyby. The magnetosheath has a high plasma β (∼ 8), and the interplanetary magnetic field (IMF) has a significant radial component. Six flux ropes are identified around the magnetopause. The motion …
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…