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JWST-TST High Contrast: JWST/NIRCam Observations of the Young Giant Planet β Pic b
Stark, Christopher C.; Valenti, Jeff A.; van der Marel, Roeland P. +14 more
We present the first JWST/NIRCam observations of the directly imaged gas giant exoplanet β Pic b. Observations in six filters using NIRCam's round coronagraphic masks provide a high-signal-to-noise-ratio detection of β Pic b and the archetypal debris disk around β Pic over a wavelength range of ∼1.7–5 µm. This paper focuses on the detection …
Beyond Point Masses. III. Detecting Haumea's Nonspherical Gravitational Field
Grundy, Will M.; Oldroyd, William J.; Proudfoot, Benjamin C. N. +3 more
The dwarf planet Haumea is one of the most compelling trans-Neptunian objects to study, hosting two small, dynamically interacting satellites, a family of nearby spectrally unique objects, and a ring system. Haumea itself is extremely oblate due to its 3.9 hr rotation period. Understanding the orbits of Haumea's satellites, named Hi'iaka and Namak…
Exploring the Mpc Environment of the Quasar ULAS J1342+0928 at z = 7.54
Finkelstein, Steven L.; Willott, Chris J.; Brammer, Gabriel +10 more
Theoretical models predict that z ≳ 6 quasars are hosted in the most massive halos of the underlying dark matter distribution and thus would be immersed in protoclusters of galaxies. However, observations report inconclusive results. We investigate the 1.1 proper-Mpc2 environment of the z = 7.54 luminous quasar ULAS J1342+0928. We searc…
Discrepancies between spectroscopy and HST photometry in tagging multiple stellar populations in 22 globular clusters
Bragaglia, Angela; Carretta, Eugenio
Multiple populations (MPs) in globular clusters (GCs) are stars that are distinct for their abundances of light elements. The MPs can be directly separated by measuring abundances of C, N, O, Na, Al, and Mg with spectroscopy or indirectly from photometric sequences created by the impact of different chemistry on band passes of particular filters, …
Spectroscopic Survey of Faint Planetary-nebula Nuclei. IV. The A35-type Central Star of Pa 27
Bond, Howard E.; Zeimann, Gregory R.
We present optical spectroscopy of the 12th-magnitude central star of the planetary nebula (PN) Patchick 27 (Pa 27), obtained during a survey of faint PN nuclei (PNNs) with the Low-Resolution Spectrograph of the Hobby–Eberly Telescope. The optical spectrum of Pa 27 is that of a K0 III red giant with rotationally broadened lines. However, the star …
GRB 231115A—a Magnetar Giant Flare in the M82 Galaxy
Minaev, P. Yu.; Pozanenko, A. S.; Grebenev, S. A. +5 more
The results of a study of the short gamma-ray burst GRB 231115A in the X-ray and gamma-ray ranges are presented, based on data from the INTEGRAL and Fermi space observatories. The source of the burst is localized by the IBIS/ISGRI telescope of INTEGRAL observatory with an accuracy of ${≤}1.\!\!^'5$, it is located in the Cigar Galaxy (M 82). Early …
Disentangling the origin of chemical differences using GHOST
Angeloni, R.; Martioli, E.; Jofré, E. +8 more
Aims: We explore different scenarios to explain the chemical difference found in the remarkable giant-giant binary system HD 138202 + CD−30 12303. For the first time, we suggest how to distinguish these scenarios by taking advantage of the extensive convective envelopes of giant stars.
Methods: We carried out a high-precision determinati…
Sub-GeV dark matter annihilation: limits from Milky Way observations with INTEGRAL
Calore, Francesca; Siegert, Thomas; Serpico, Pasquale Dario
From 16 years of INTEGRAL/SPI γ-ray observations, we derive bounds on annihilating light dark matter particles in the halo of the Milky Way up to masses of about 300 MeV. We test four different spatial templates for the dark matter halo, including a Navarro-Frenk-White (NFW), Einasto, Burkert, and isothermal sphere profile, as well as three differ…
Investigating coronal loop morphology and dynamics from two vantage points
Teriaca, Luca; Solanki, Sami K.; Schühle, Udo +9 more
Coronal loops are the fundamental building blocks of the solar corona. Therefore, comprehending their properties is essential in unraveling the dynamics of the upper solar atmosphere. In this study, we conduct a comparative analysis of the morphology and dynamics of a coronal loop observed from two different spacecraft: the High Resolution Imager …
Detection of Accretion Shelves Out to the Virial Radius of a Low-mass Galaxy with JWST
van Dokkum, Pieter; Conroy, Charlie; Johnson, Benjamin D. +8 more
We report the serendipitous discovery of an extended stellar halo surrounding the low-mass galaxy Ark 227 (M * = 5 × 109 M ⊙; d = 35 Mpc) in deep JWST NIRCam imaging from the Blue Jay Survey. The F200W–F444W color provides robust star–galaxy separation, enabling the identification of stars at very low density. By c…