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Título de Acceso Abierto
The Astrophysical Journal Letters (ApJL)
Resumen/Descripción – provisto por la editorial en inglés
The Astrophysical Journal Letters is an open access express scientific journal that allows astrophysicists to rapidly publish short notices of significant original research. ApJL articles are timely, high-impact, and broadly understandable.Palabras clave – provistas por la editorial
astronomy; astrophysics
Disponibilidad
| Institución detectada | Período | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No detectada | desde ene. 2010 / hasta dic. 2023 | IOPScience |
Información
Tipo de recurso:
revistas
ISSN impreso
2041-8205
ISSN electrónico
2041-8213
Editor responsable
American Astronomical Society (AAS)
Idiomas de la publicación
- inglés
País de edición
Reino Unido
Información sobre licencias CC
Cobertura temática
Tabla de contenidos
ALMA Polarimetry of AT2018cow
Kuiyun Huang; Jiro Shimoda; Yuji Urata
; Kenji Toma; Kazutaka Yamaoka; Keiichi Asada; Hiroshi Nagai; Satoko Takahashi; Glen Petitpas; Makoto Tashiro
<jats:title>Abstract</jats:title> <jats:p>We present the first radio polarimetric observations of a fast-rising blue optical transient, AT2018cow. Two epochs of polarimetry with additional coincident photometry were performed with the Atacama Large Millimeter/submillimeter Array. The overall photometric results based on simultaneous observations in the 100 and 230 GHz bands are consistent with the nonthermal radiation model reported by Ho et al. and indicate that the spectral peaks (∼110 GHz at the first epoch and ∼67 GHz at the second epoch) represent the synchrotron self-absorption frequency. The non-detection of linear polarization with <0.15% in the 230 GHz band at the phase when the effect of synchrotron self-absorption was quite small in the band may be explained by internal Faraday depolarization with high circumburst density and strong magnetic field. This result supports the stellar explosion scenario rather than the tidal disruption model. The maximum energy of accelerating particles at the shocks of AT2018cow-like objects is also discussed.</jats:p>
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L25
Formation of Transition Alumina Dust around Asymptotic Giant Branch Stars: Condensation Experiments using Induction Thermal Plasma Systems
Aki Takigawa; Tae-Hee Kim; Yohei Igami; Tatsuki Umemoto; Akira Tsuchiyama; Chiyoe Koike; Junya Matsuno; Takayuki Watanabe
<jats:title>Abstract</jats:title> <jats:p>Mid-infrared spectroscopic observations of oxygen-rich asymptotic giant branch (AGB) stars show the common presence of dust species that have a broad feature at ∼11–12 <jats:italic>μ</jats:italic>m. Chemically synthesized amorphous alumina (Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) is widely accepted as the source of this emission, although it is not obvious that amorphous alumina can condense in circumstellar conditions. We performed condensation experiments of Al–Si–Mg–O and Mg–Al–O gases using induction thermal plasma systems, in which small particles condense from vapors with a steep temperature gradient. The condensates were analyzed using X-ray diffraction and Fourier transform infrared spectroscopy, and observed with a transmission electron microscope. The condensed nanoparticles from the Al and O gases were transition aluminas based on face-centered cubic (fcc) packed oxygen (<jats:italic>δ</jats:italic>- and <jats:italic>λ</jats:italic>-alumina, and an unknown phase). The fcc oxygen frameworks were maintained in the condensed alumina containing small amounts of Mg and Si. Condensates from the gases of Al:Mg = 99:1 and 95:5 had <jats:italic>δ</jats:italic>- and <jats:italic>γ</jats:italic>-alumina structures. Particles with <jats:italic>λ</jats:italic>- and <jats:italic>γ</jats:italic>-alumina structures formed from starting materials of Al:Si = 9:1 and Al:Si:Mg = 8:1:1, respectively. Amorphous silica-rich particles condensed from gases of Al/(Si+Al) < 0.75. The condensed transition alumina containing ∼10% Si showed similar spectral shapes to the observed dust emission from the alumina-rich AGB star T Cep. Based on the present results, it is reasonable that the source of 11–12 <jats:italic>μ</jats:italic>m broad emission of alumina-rich stars is not amorphous alumina, but is transition alumina containing ∼10% Si.</jats:p>
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L7
SOFIA/EXES Observations of Warm H2 at High Spectral Resolution: Witnessing Para-to-ortho Conversion behind a Molecular Shock Wave in HH7
David A. Neufeld; Curtis DeWitt; Pierre Lesaffre; Sylvie Cabrit; Antoine Gusdorf; Le Ngoc Tram; Matthew Richter
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L18
Probing the Innermost Ejecta Layers in Supernova Remnant Kes 75: Implications for the Supernova Progenitor
Tea Temim; Patrick Slane; Tuguldur Sukhbold; Bon-Chul Koo; John C. Raymond; Joseph D. Gelfand
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L19
Evidence of Surface Catalytic Effect on Cosmic Dust Grain Analogs: The Ammonia and Carbon Dioxide Surface Reaction
Alexey Potapov; Patrice Theulé; Cornelia Jäger; Thomas Henning
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L20
Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase
Raghubar Singh; Bacham E. Reddy; Yerra Bharat Kumar; H. M. Antia
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L21
Discovery of Soft X-Ray Pulsations from PSR J1231–1411 using NICER
Paul S. Ray; Sebastien Guillot; Scott M. Ransom; Matthew Kerr; Slavko Bogdanov; Alice K. Harding; Michael T. Wolff; Christian Malacaria; Keith C. Gendreau; Zaven Arzoumanian; Craig Markwardt; Yang Soong; John P. Doty
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L22
The Supersonic Project: Shining Light on SIGOs—A New Formation Channel for Globular Clusters
Yeou S. Chiou; Smadar Naoz; Blakesley Burkhart; Federico Marinacci; Mark Vogelsberger
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L23
Inner Heliosheath Shocks and Their Effect on Energetic Neutral Atom Observations by IBEX
P. Mostafavi; G. P. Zank; E. J. Zirnstein; D. J. McComas
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L24
ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C
Tanmoy Laskar; Kate D. Alexander; Ramandeep Gill; Jonathan Granot; Edo Berger; C. G. Mundell; Rodolfo Barniol Duran; J. Bolmer; Paul Duffell; Hendrik van Eerten; Wen-fai Fong; Shiho Kobayashi; Raffaella Margutti; Patricia Schady
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. L26