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Assessment of the cosmic distance duality relation using Gaussian process
Mukherjee, Ankan; Mukherjee, Purba
Two types of distance measurement are important in cosmological observations, the angular diameter distance dA and the luminosity distance dL. In this work, we carried out an assessment of the theoretical relation between these two distance measurements, namely the cosmic distance-duality relation, from type Ia supernova (SN-…
New optically identified supernova remnants in the Large Magellanic Cloud
Maitra, Chandreyee; Sasaki, Manami; Alsaberi, Rami Z. E. +20 more
We present a new optical sample of three Supernova Remnants (SNRs) and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud (LMC). These objects were originally selected using deep H α, [S II], and [O III] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC's ma…
First Solar Orbiter observation of the Alfvénic slow wind and identification of its solar source
André, N.; Fedorov, A.; Livi, S. +27 more
Context. Turbulence dominated by large-amplitude, nonlinear Alfvén-like fluctuations mainly propagating away from the Sun is ubiquitous in high-speed solar wind streams. Recent studies have demontrated that slow wind streams may also show strong Alfvénic signatures, especially in the inner heliosphere.
Aims: The present study focuses on the c…
Detectability of biosignatures on LHS 1140 b
Rauer, Heike; Sousa-Silva, Clara; Wunderlich, Fabian +4 more
Context. Terrestrial extrasolar planets around low-mass stars are prime targets when searching for atmospheric biosignatures with current and near-future telescopes. The habitable-zone super-Earth LHS 1140 b could hold a hydrogen-dominated atmosphere, and is an excellent candidate for detecting atmospheric features.
Aims: In this study we inv…
A Study of the Photometric and Spectroscopic Variations of the Prototypical FU Orionis-type Star V1057 Cyg
Cseh, B.; Kriskovics, L.; Pál, A. +19 more
Among the low-mass pre-main sequence stars, a small group called FU Orionis-type objects (FUors) are notable for undergoing powerful accretion outbursts. V1057 Cyg, a classical example of an FUor, went into outburst around 1969-1970, after which it faded rapidly, making it the fastest-fading FUor known. Around 1995, a more rapid increase in fading…
ALMA CO observations of a giant molecular cloud in M 33: Evidence for high-mass star formation triggered by cloud-cloud collisions
Tokuda, Kazuki; Tachihara, Kengo; Sasaki, Manami +14 more
We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M 33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M 33 using 12CO(J = 2-1), 13CO(J = 2-1), and C18O(J = 2-1) line emission …
Vortex-like kinematic signal, spirals, and beam smearing effect in the HD 142527 disk
Pinte, C.; Ménard, F.; van der Plas, G. +8 more
Vortices are one of the most promising mechanisms to locally concentrate millimeter dust grains and allow the formation of planetesimals through gravitational collapse. The outer disk around the binary system HD 142527 is known for its large horseshoe structure with azimuthal contrasts of ~3-5 in the gas surface density and of ~50 in the dust. Usi…
A magnetic reconnection model for hot explosions in the cool atmosphere of the Sun
Ni, Lei; Chen, Yajie; Lin, Jun +2 more
Context. Ultraviolet (UV) bursts and Ellerman bombs (EBs) are transient brightenings observed in the low solar atmospheres of emerging flux regions. Magnetic reconnection is believed to be the main mechanism leading to formation of the two activities, which are usually formed far apart from each other. However, observations also led to the discove…
Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton
Kolotkov, Dmitrii Y.; Kuznetsov, Alexey A.
Solar and stellar flares are powerful events that produce intense radiation across the electromagnetic spectrum. Multiwavelength observations are highly important for understanding the nature of flares, because different flare-related processes reveal themselves in different spectral ranges. To study the correlation between thermal and nonthermal …
A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020
Handler, G.; Vanderburg, A.; Saio, H. +13 more
We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency of 21.09533 d-1. This pulsation exhibits a septuplet of orbital sidelobes as well as a harmonic quintuplet. Using th…