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Joahan Castaneda

As seen in: arXiv, Caltech
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Articles by Joahan Castaneda

Astrophysics > High Energy Astrophysical Phenomena

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By S. C. Bradley, Joahan Castaneda
| arXiv
Partial tidal disruption events, in which a star survives a close passage by a supermassive black hole and may be disrupted again on a subsequent encounter, provide a unique probe of supermassive black hole properties and accretion physics.
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Illuminating the Local Universe: Large-Scale Structure from ZTF Type Ia Supernovae

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By Antoine Gilles, Joahan Castaneda
| Caltech
Abstract Within the volume-limited subsample at z < 0.06 of the Zwicky Transient Facility (ZTF) DR2 sample, we confirm a statistically significant excess of Type Ia supernovae (SNe Ia) around z ≃ 0.02–0.04, previously reported but not explained by survey selection effects. Forward simulations assuming a uniform volumetric SN Ia rate and realistic ZTF detection efficiencies fail to reproduce the feature, rejecting this hypothesis at a 12.2σ level for the volume-limited sample.
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ZTF SN Ia DR2 follow-up: Early excess in Type Ia supernova light curves

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By Joahan Castaneda
| Caltech
Published October 2026 | Version Published Journal Article Open Müller-Bravo, Tomás E.1, 2 Maguire, Kate1 Alburai, Alaa3, 4 Burgaz, Umut1 Dimitriadis, Georgios5 Galbany, Lluís3, 4 Johansson, Joel6 Kim, Young-Lo7 Liu, Chang8, 9 Miller, Adam A.8, 9 Smith, Mathew5 Sollerman, Jesper6 Bellm, Eric C.10 Jaimes, Joahan Castaneda11 Kasliwal, Mansi M.11 Laher, Russ R.12 Smith, Roger11 Sravan, Niharika13 1. Trinity College Dublin 2. Arturo Prat University 3. Institute of Space Sciences 4.
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Astrophysics > Cosmology and Nongalactic Astrophysics

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By Antoine Gilles, Joahan Castaneda
| arXiv
[Submitted on 14 Apr 2026 (v1), last revised 24 Sep 2026 (this version, v2)] View PDF HTML (experimental) Comments: Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cite as: arXiv:2604.12714 [astro-ph.CO] (or arXiv:2604.12714v2 [astro-ph.CO] for this version) https://doi.org/10.48550/arXiv.2604.12714
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