Rajika Kuruwita

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About Rajika Kuruwita:

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SEEK ID: https://publications.h-its.org/people/195

Location: Germany

ORCID: https://orcid.org/0000-0002-9236-2919

Joined: 9th Jan 2024

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Stellar Evolution Theory

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Start date: 1st Jan 2021

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Heidelberg Institute for Theoretical Studies

Country: Germany

City: Heidelberg

Web page: https://www.h-its.org

Showing 5 out of a possible 7 Publications Advanced Publications list for this Person with search and filtering

Simulated analogues I: apparent and physical evolution of young binary protostellar systems

Stellar Evolution Theory

Abstract (Expand)

ABSTRACT Protostellar binaries harbour complex environment morphologies. Observations represent a snapshot in time, and projection and optical depth effects impair our ability to interpret them. Careful …

Authors: Vito Tuhtan, Rami Al-Belmpeisi, Mikkel Bregning Christensen, Rajika Kuruwita, Troels Haugbølle

Date Published: 1st Nov 2024

Publication Type: Journal

DOI: 10.1093/mnras/stae2215

Citation: Monthly Notices of the Royal Astronomical Society 534(4):3176-3193

Created: 3rd Feb 2025 at 13:10, Last updated: 3rd Feb 2025 at 13:10

Simulated analogues II: a new methodology for non-parametric matching of models to observations

Stellar Evolution Theory

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ABSTRACT Star formation is a multiscale problem, and only global simulations that account for the connection from the molecular cloud-scale gas flow to the accreting protostar can reflect the observed …

Authors: Rami Al-Belmpeisi, Vito Tuhtan, Mikkel Bregning Christensen, Rajika Kuruwita, Troels Haugbølle

Date Published: 1st Nov 2024

Publication Type: Journal

DOI: 10.1093/mnras/stae2216

Citation: Monthly Notices of the Royal Astronomical Society 534(4):3194-3210

Created: 3rd Feb 2025 at 13:10, Last updated: 3rd Feb 2025 at 13:10

Protostellar spin-up and fast rotator formation through binary star formation

Stellar Evolution Theory

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Context. Many fast-rotating stars (rotation periods of < 2 days) are found to be unresolved binaries with separations of tens of AU. This correlation between fast rotators and binarity leads to the …ween fast rotators and binarity leads to the question of whether the formation of binary stars inherently produces fast rotators. Aims. Our goal is to understand the spin evolution of protostars and whether the formation of companions plays a role in spinning up stars. Methods. We used magneto-hydrodynamic simulations to study the formation of multiple star systems from turbulent and non-turbulent protostellar cores. We tracked the angular momentum accreted by individual star and inner disc systems by using a sink (star) particle technique. We ran a resolution study to extrapolate protostellar properties. Results. We find in all simulations that the primary star can experience a spin-up event correlated with the formation of companions, namely fragmentation into binaries or higher-order systems. The primary star can spin up by up to 84% of its pre-fragmentation angular momentum and by up to 18% of its pre-fragmentation mass-specific angular momentum. The mechanism for the spin-up is gravitational disc instabilities in the circumstellar disc around the primary star, which leads to the accretion of material with high specific angular momentum. The simulations that experience the strongest disc instabilities fragment to form companions. Simulations with weaker spin-up events experience disc instabilities triggered by a companion flyby, and the disc instability in these cases typically does not produce further fragments (i.e. they remain binary systems). Conclusions. The primary star in multiple star systems can end up with a higher spin than single stars. This is because gravitational instabilities in the circumstellar disc around the primary star can trigger a spin-up event. In the strongest spin-up events, the instability is likely to cause disc fragmentation and the formation of companions. This spin-up mechanism, coupled with shorter disc lifetimes due to truncated circumstellar discs (and thus short spin-down times), may help produce fast rotators.

Authors: Rajika L. Kuruwita, Christoph Federrath, Marina Kounkel

Date Published: 1st Oct 2024

Publication Type: Journal

DOI: 10.1051/0004-6361/202450467

Citation: A&A 690:A272

Created: 3rd Feb 2025 at 13:08, Last updated: 3rd Feb 2025 at 13:08

Orbital architectures of planet-hosting binaries – III. Testing mutual inclinations of stellar and planetary orbits in triple-star systems

Stellar Evolution Theory

Abstract (Expand)

ABSTRACT Transiting planets in multiple-star systems, especially high-order multiples, make up a small fraction of the known planet population but provide unique opportunities to study the environments …

Authors: Elise L Evans, Trent J Dupuy, Kendall Sullivan, Adam L Kraus, Daniel Huber, Michael J Ireland, Megan Ansdell, Rajika L Kuruwita, Raquel A Martinez, Mackenna L Wood

Date Published: 1st Oct 2024

Publication Type: Journal

DOI: 10.1093/mnras/stae2095

Citation: Monthly Notices of the Royal Astronomical Society 534(1):575-607

Created: 3rd Feb 2025 at 13:09, Last updated: 3rd Feb 2025 at 13:09

Observations of high-order multiplicity in a high-mass stellar protocluster

Stellar Evolution Theory

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Abstract The dominant mechanism forming multiple stellar systems in the high-mass regime ( M * ≳ 8 M ⊙ ) remained unknown because direct imaging of multiple protostellar systems at early phases of …

Authors: Shanghuo Li, Patricio Sanhueza, Henrik Beuther, Huei-Ru Vivien Chen, Rolf Kuiper, Fernando A. Olguin, Ralph E. Pudritz, Ian W. Stephens, Qizhou Zhang, Fumitaka Nakamura, Xing Lu, Rajika L. Kuruwita, Takeshi Sakai, Thomas Henning, Kotomi Taniguchi, Fei Li

Date Published: 15th Jan 2024

Publication Type: Journal

DOI: 10.1038/s41550-023-02181-9

Citation: Nat Astron

Created: 16th Jan 2024 at 14:08, Last updated: 5th Mar 2024 at 21:25

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