Search Publications
Revisiting the Architecture of the KOI-89 System
Tamayo, Daniel; Masuda, Kento
While high stellar obliquities observed in exoplanetary systems may be attributed to processes that tilt the planetary orbits, it is also possible that they reflect misalignments between protoplanetary disks and stellar spins. This latter hypothesis predicts the presence of coplanar multiplanetary systems misaligned with their central stars. Here …
Chemical and Isotope Composition of Comet 67P/Churyumov-Gerasimenko: The Rosetta-Philae Mission Results Reviewed in the Context of Cosmogony and Cosmochemistry
Dorofeeva, V. A.
The studies of the composition and structure of comet 67P/Churyumov-Gerasimenko—a short-period comet of Jupiter's family—which was an object of the recent Rosetta-Philae space mission, yielded results unique in many respects, since it was the first time that a comet was investigated in situ for a long stretch of time under varying conditions of in…
Mars' Ionospheric Interaction With Comet C/2013 A1 Siding Spring's Coma at Their Closest Approach as Seen by Mars Express
Leblanc, François; Cowley, Stanley W. H.; Cardesín-Moinelo, Alejandro +9 more
On 19 October 2014, Mars experienced a close encounter with Comet C/2013 A1 Siding Spring. Using data from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) on board Mars Express (MEX), we assess the interaction of the Martian ionosphere with the comet's coma and possibly magnetic tail during the orbit of their closest approa…
Simulations of satellite tidal debris in the Milky Way halo
Just, Andreas; Macciò, Andrea V.; Mazzarini, Matteo +1 more
Aims: We study the distribution of the stellar and dark matter debris of the Milky Way satellites.
Methods: For the first time we address the question of the tidal disruption of satellites in simulations by utilising simultaneously (a) a realistic set of orbits extracted from cosmological simulations; (b) a three-component host galaxy wi…
J1110+4817 - a compact symmetric object candidate revisited
Krezinger, Máté; Frey, Sándor; An, Tao +2 more
Compact symmetric objects (CSOs) are radio-emitting active galactic nuclei (AGNs) typically with a double-lobed radio structure confined to within 1 kpc. CSOs represent the earliest evolutionary phase of jetted AGNs. Some of them may eventually evolve into large-scale extended double sources, while others stall within the host galaxy and die out, …
Locating Hot Plasma in Small Flares using Spectroscopic Overlappogram Data from the Hinode EUV Imaging Spectrometer
Reeves, Katharine K.; Lee, Kyoung-Sun; Hara, Hirohisa +6 more
One of the key processes associated with the "standard" flare model is chromospheric evaporation, a process during which plasma heated to high temperatures by energy deposition at the flare footpoints is driven upwards into the corona. Despite several decades of study, a number of open questions remain, including the relationship between plasma pr…
Unveiling kinematic structure in the starburst heart of NGC 253
Turner, Jean L.; Consiglio, S. Michelle; Cohen, Daniel P.
We observed the Brackett α emission line (4.05 µm) within the nuclear starburst of NGC 253 to measure the kinematics of ionized gas, and distinguish motions driven by star formation feedback from gravitational motions induced by the central mass structure. Using NIRSPEC on Keck II, we obtained 30 spectra through a 0.5 arcsec slit stepped acr…
Chain of responses of geomagnetic and ionospheric storms to a bunch of central coronal hole and high speed stream of solar wind
Gulyaev, R. A.; Gulyaeva, T. L.
Results of analysis of the proxy of Coronal Hole (CH) Power index, Pch, combined with the high speed streams HSS of solar wind for a period from 2011 to 2019 are presented. It is found that the long-term variation of Pch index shows a trend of growing Pch towards the minimum of solar cycle while most of other identities of solar activity tend to d…
Anomalous Phyllosilicate-Bearing Outcrops South of Coprates Chasma: A Study of Possible Emplacement Mechanisms
Seelos, Frank P.; Murchie, Scott L.; Buczkowski, Debra L. +4 more
The formation of widespread phyllosilicate-bearing near-surface layers on Mars has often been attributed to pedogenesis, a process of weathering basaltic soils by continued exposure to meteoric water percolating down from the surface, which can result in layers of aluminum phyllosilicates forming over layers of iron-magnesium phyllosilicates. We p…
Statistical Signatures of Nanoflare Activity. II. A Nanoflare Explanation for Periodic Brightenings in Flare Stars Observed by NGTS
Mathioudakis, M.; Wheatley, P. J.; Goad, M. R. +9 more
Several studies have documented periodic and quasi-periodic signals from the time series of dMe flare stars and other stellar sources. Such periodic signals, observed within quiescent phases (i.e., devoid of larger-scale microflare or flare activity), range in a period from 1 to 1000 s and hence have been tentatively linked to ubiquitous p-mode os…