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Nitrogen fractionation towards a pre-stellar core traces isotope-selective photodissociation
Caselli, P.; Spezzano, S.; Sipilä, O. +1 more
Context. Isotopologue abundance ratios are important to understand the evolution of astrophysical objects and ultimately the origins of a planetary system such as our own. With nitrogen being a fundamental ingredient of pre-biotic material, understanding its chemistry and inheritance is of fundamental importance to understand the formation of the …
The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+
Pattle, Kate; Ward-Thompson, Derek; Berry, David +31 more
Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties, and grain alignment efficiency, as well as their variations in the line of sight, making it difficult to interpret polarization unambiguously. The co…
Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
Hill, Ryley; Scott, Douglas; Dole, Hervé +3 more
The Planck list of high-redshift source candidates (the PHz catalogue) contains 2151 peaks in the cosmic infrared background, unresolved by Planck's 5 arcmin beam. Follow-up spectroscopic observations have revealed that some of these objects are $z\, {\approx }\, 2$ protoclusters and strong gravitational lenses but an unbiased survey has not yet b…
Constructing the Milky Way Stellar Halo in the Galactic Center by Direct Orbit Integration
Yang, Chengqun; Liu, Chao; Xue, Xiang-Xiang +2 more
The halo stars on highly-radial orbits should inevitably pass the center regions of the Milky Way. Under the assumption that the stellar halo is in "dynamical equilibrium" and is axisymmetric, we integrate the orbits of ~10,000 halo K giants at 5 ≤ r ≤ 50 kpc cross-matched from LAMOST DR5 and Gaia DR3. By carefully considering the selection functi…
ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Evidence for a Molecular Jet Launched at an Unprecedented Early Phase of Protostellar Evolution
Sanhueza, Patricio; Kwon, Woojin; Soam, Archana +31 more
Protostellar outflows and jets play a vital role in star formation as they carry away excess angular momentum from the inner disk surface, allowing the material to be transferred toward the central protostar. Theoretically, low-velocity and poorly collimated outflows appear from the beginning of the collapse at the first hydrostatic core (FHSC) st…
The GAPS programme at TNG. XL. A puffy and warm Neptune-sized planet and an outer Neptune-mass candidate orbiting the solar-type star TOI-1422
Moutou, C.; Pagano, I.; Winn, J. N. +55 more
Context. Neptunes represent one of the main types of exoplanets and have chemical-physical characteristics halfway between rocky and gas giant planets. Therefore, their characterization is important for understanding and constraining both the formation mechanisms and the evolution patterns of planets.
Aims: We investigate the exoplanet candid…
KMT-2021-BLG-0240: Microlensing event with a deformed planetary signal
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +19 more
Aims: The light curve of the microlensing event KMT-2021-BLG-0240 exhibits a short-lasting anomaly with complex features near the peak at the 0.1 mag level from a single-lens single-source model. We conducted modeling of the lensing light curve under various interpretations to reveal the nature of the anomaly.
Methods: It is found that t…
X-ray timing and spectral analysis of reverberating active galactic nuclei
Chainakun, P.; Young, A. J.; Hancock, S.
We use the publicly available XMM-Newton archive to select a sample of 20 active galactic nuclei (AGNs) known to exhibit reverberation signatures caused by the reflection of X-rays from the corona off the accretion disc that feeds the central black hole engine. Inverse Compton scattering by energetic electrons, coupled with accretion disc fluctuat…
The rise time of the change of cometary brightness during its outburst
Wesołowski, Marcin
The paper presents a new method for determining the change in the brightness of a comet during an outburst in which particles are ejected into the coma at a uniform rate, i.e. via a long-lived jet. In the proposed approach, the mass flow rate by a jet and the time it takes to increase the brightness of the comet play key roles. Absolute values ado…
A Segmented Period-Luminosity Relation for Nearby Extragalactic Delta Scuti Stars
Martínez-Vázquez, C. E.; Catelan, M.; Vivas, A. K. +1 more
The period-luminosity relations (PLRs) of Milky Way δ Scuti (δ Sct) stars have been described to the present day by a linear relation. However, when studying extragalactic systems such as the Magellanic Clouds and several dwarf galaxies, we notice for the first time a nonlinear behavior in the PLR of δ Sct stars. Using the largest sample of ~3700 …