Search Publications
YZ Phoenicis: a very short period K-type contact binary with variation of the O'Connell effect and orbital period change
Li, Lin-Jia; Qian, Sheng-Bang; Zhang, Jia +7 more
YZ Phe is a very short-period contact binary (Sp. = K2 V) with an orbital period of 0.2347 d near the short period limit (0.22 d). We present the complete light curves which photometric data were obtained from the 60 cm telescope of PROMPT-8 at CTIO in Chile during 2016 June to October and 2017 August. The photometric solutions were determined by …
Full inversion of solar relativistic electron events measured by the Helios spacecraft
Lario, D.; Heber, B.; Aran, A. +2 more
Context. The Parker Solar Probe and the incoming Solar Orbiter mission will provide measurements of solar energetic particle (SEP) events at close heliocentric distances from the Sun. Up to present, the largest data set of SEP events in the inner heliosphere are the observations by the two Helios spacecraft.
Aims: We re-visit a sample of 15 s…
Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies
Mroczkowski, Tony; De Breuck, Carlos; Stroe, Andra +2 more
We present CO (2-1) observations of 72 galaxies in the nearby, disturbed Antlia Cluster with the Atacama Pathfinder Experiment telescope. The galaxies in our sample are selected to span a wide range of stellar masses (108 M ⊙ ≲ M ⋆ ≲ 1010 M ⊙) and star formation rates (0.0005 M ⊙ yr…
The peculiar chemistry of the inner ejecta of Eta Carina
Bordiu, Cristobal; Rizzo, J. Ricardo
We investigated continuum and molecular line emission of four species (CO, HCN, H13CN, and HCO+) at 0.8 mm in the inner region around η Car, using ALMA archival observations at a resolution better than 0.2 arcsec. We report the discovery of an asymmetric extended structure north-west of the star, independent from the continuu…
High-resolution spectroscopic study of dwarf stars in the northern sky. Na to Zn abundances in two fields with radii of 20 degrees
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +6 more
Context. New space missions, such as NASA TESS or ESA PLATO, will focus on bright stars, which have been largely ignored by modern large surveys, especially in the northern sky. Spectroscopic information is of paramount importance in characterising the stars and analysing planets possibly orbiting them, and in studying the Galactic disc evolution.…
From the stellar properties of HD 219134 to the internal compositions of its transiting exoplanets
Poretti, E.; Lebreton, Y.; Borsa, F. +8 more
Context. The harvest of exoplanet discoveries has opened the area of exoplanet characterisation. But this cannot be achieved without a careful analysis of the host star parameters.
Aims: The system of HD 219134 hosts two transiting exoplanets and at least two additional non-transiting exoplanets. We revisit the properties of this system using…
KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +55 more
We announce the discovery of KELT-23Ab, a hot Jupiter transiting the relatively bright (V = 10.3) star BD+66 911 (TYC 4187-996-1), and characterize the system using follow-up photometry and spectroscopy. A global fit to the system yields host-star properties of {T}eff} =5900+/- 49 K, {M}* ={0.945}-0.054+0.060<…
Molecular Gas Properties in the Host Galaxy of GRB 080207
Hashimoto, Tetsuya; Tamura, Yoichi; Kohno, Kotaro +5 more
We present the results of CO(1-0) and CO(4-3) observations of the host galaxy of a long-duration gamma-ray burst GRB 080207 at z = 2.0858 by using the Karl G. Jansky Very Large Array and the Atacama Large Millimeter/submillimeter Array. The host is detected in CO(1-0) and CO(4-3), becoming the first case for a gamma-ray burst (GRB) host with more …
Suzaku detection of enigmatic geocoronal solar wind charge exchange event associated with coronal mass ejection
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +5 more
Suzaku detected an enhancement of the soft X-ray background associated with solar eruptions on 2013 April 14-15. The solar eruptions were accompanied by an M6.5 solar flare and a coronal mass ejection with magnetic flux ropes. The enhanced soft X-ray background showed a slight variation over half a day and then a clear one in a few hours. The form…
A broadband spectral analysis of 4U 1702-429 using XMM-Newton and BeppoSAX data
Santangelo, A.; Sanna, A.; Segreto, A. +8 more
Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system.
Aims…