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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

https://creativecommons.org/licenses/by/4.0/

Cobertura temática

Ciencias físicas

Tabla de contenidos

doi: 10.3847/2041-8213/ab212d

NICER Observations of the 2018 Outburst of XTE J1810−197

Tolga Güver; Ersin Göğüş; Eda Vurgun; Teruaki Enoto; Keith C. Gendreau; Takanori Sakamoto; Eric V. Gotthelf; Zaven Arzoumanian; Sebastien Guillot; Gaurava K. Jaisawal; Christian Malacaria; Walid A. Majid

Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.

Pp. L30

doi: 10.3847/2041-8213/ab21de

Strong Evidence of Anomalous Microwave Emission from the Flux Density Spectrum of M31

E. S. Battistelli; S. Fatigoni; M. Murgia; A. Buzzelli; E. Carretti; P. Castangia; R. Concu; A. Cruciani; P. de Bernardis; R. Genova-Santos; F. Govoni; F. Guidi; L. Lamagna; G. Luzzi; S. Masi; A. Melis; R. Paladini; F. Piacentini; S. Poppi; F. Radiconi; R. Rebolo; J. A. Rubino-Martin; A. Tarchi; V. Vacca

Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.

Pp. L31

doi: 10.3847/2041-8213/ab21c2

Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk

Meredith A. MacGregor; Alycia J. Weinberger; Erika R. Nesvold; A. Meredith Hughes; D. J. Wilner; Thayne Currie; John H. Debes; Jessica K. Donaldson; Seth Redfield; Aki Roberge; Glenn Schneider

Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.

Pp. L32

doi: 10.3847/2041-8213/ab1de5

Strong Preferential Ion Heating is Limited to within the Solar Alfvén Surface

Justin C. Kasper; Kristopher G. Klein

<jats:title>Abstract</jats:title> <jats:p>The decay of the solar wind helium-to-hydrogen temperature ratio due to Coulomb thermalization can be used to measure how far from the Sun strong preferential ion heating occurs. Previous work has shown that a zone of preferential ion heating, resulting in mass-proportional temperatures, extends about 20–40 <jats:italic>R</jats:italic> <jats:sub>⊙</jats:sub> from the Sun on average. Here we look at the motion of the outer boundary of this zone with time and compare it to other physically meaningful distances. We report that the boundary moves in lockstep with the Alfvén point over the solar cycle, contracting and expanding with solar activity with a correlation coefficient of better than 0.95 and with an rms difference of 4.23 <jats:italic>R</jats:italic> <jats:sub>⊙</jats:sub>. Strong preferential ion heating is apparently predominately active below the Alfvén surface. To definitively identify the underlying preferential heating mechanisms, it will be necessary to make in situ measurements of the local plasma conditions below the Alfvén surface. We predict that the Parker Solar Probe (PSP) will be the first spacecraft to directly observe this heating in action, but only a couple of years after launch as activity increases, the zone expands, and PSP’s perihelion drops.</jats:p>

Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.

Pp. L35

Accedé al texto completo

doi: 10.3847/2041-8213/ab21cb

Why Do Torus-unstable Solar Filaments Experience Failed Eruptions?

Zhenjun Zhou; Xin Cheng; Jie Zhang; Yuming Wang; Dong Wang; Lijuan Liu; Bin Zhuang; Jun Cui

<jats:title>Abstract</jats:title> <jats:p>We study the magnetic field and 3D configuration of 16 filament eruptions during 2010 July–2013 February in order to investigate the factors that control the success and/or failure of solar eruptions. All of these events, i.e., eruptions that failed to be ejected and become coronal mass ejections, have filament maximum heights exceeding 100 Mm. The magnetic field of filament source regions is approximated by a potential field extrapolation method. The filament 3D configuration is reconstructed from three vantage points by the observations of <jats:italic>Solar Terrestrial Relations Observatory Ahead</jats:italic>/<jats:italic>Behind</jats:italic> and <jats:italic>Solar Dynamics Observatory</jats:italic> spacecraft. We calculate the decay index at the apex of these failed filaments and find that in seven cases, their apex decay indexes exceed the theoretical threshold (<jats:italic>n</jats:italic> <jats:sub>crit</jats:sub> = 1.5) of the torus instability (TI). We further determine the orientation change or rotation angle of each filament top during the eruption. Finally, the distribution of these events in the parameter space of rotation angle versus decay index is established. Four distinct regimes in the parameter space are empirically identified. We find that all the torus-unstable cases (decay index <jats:italic>n</jats:italic> > 1.5) have large rotation angles ranging from 50° to 130°. The possible mechanisms leading to the rotation and failed eruption are discussed. These results imply that, in addition to the TI, the rotation motion during the eruption may also play a significant role in solar eruptions.</jats:p>

Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.

Pp. L28