Detection of a high-velocity prominence eruption leading to a CME associated with a superflare on the RS CVn-type star V1355 Orionis

Abstract

Stellar coronal mass ejections (CMEs) have recently received much attention for their impacts on exoplanets and stellar evolution. Detecting prominence eruptions, the initial phase of CMEs, as the blue-shifted excess component of Balmer lines is a technique to capture stellar CMEs. However, most of prominence eruptions identified thus far have been slow and less than the surface escape velocity. Therefore, whether these eruptions were developing into CMEs remained unknown. In this study, we conducted simultaneous optical photometric observations with Transiting Exoplanet Survey Satellite and optical spectroscopic observations with the 3.8m Seimei Telescope for the RS CVn-type star V1355 Orionis that frequently produces large-scale superflares. We detected a superflare releasing $7.0\times 10^{35}\mathrm{erg}$. In the early stage of this flare, a blue-shifted excess component of $\mathrm{H}\alpha$ extending its velocity up to $760-1690\mathrm{km}{\mathrm{s}}^{-1}$ was observed and thought to originate from prominence eruptions. The velocity greatly exceeds the escape velocity (i.e., $\sim 350\mathrm{km}{\mathrm{s}}^{-1}$), which provides important evidence that stellar prominence eruptions can develop into CMEs. Furthermore, we found that the prominence is very massive ($9.5\times 10^{18}\mathrm{g}<M<1.4\times 10^{21}\mathrm{g}$). These data will clarify whether such events follow existing theories and scaling laws on solar flares and CMEs even when the energy scale far exceeds solar cases.

16 pages, 8 figures. Accepted for publication in The Astrophysical Journal

References in corpus (15)

• The Transiting Exoplanet Survey Satellite
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Probable detection of an eruptive filament from a superflare on a solar-type star
• The Stellar CME-flare relation: What do historic observations reveal?
• The quest for stellar coronal mass ejections in late-type stars: I. Investigating Balmer-line asymmetries of single stars in Virtual Observatory data
• Time-resolved spectroscopy and photometry of an M dwarf flare star YZ Canis Minoris with OISTER and TESS: Blue asymmetry in H$\alpha$ line during the non-white light flare
• Multiwavelength observations of a giant flare on CN Leonis I. The chromosphere as seen in the optical spectra
• Optical and X-ray observations of stellar flares on an active M dwarf AD Leonis with Seimei Telescope, SCAT, NICER and OISTER
• High-resolution spectroscopy of flares and CMES on AD Leo*
• Scaling Relations in Coronal Mass Ejections and Energetic Proton Events associated with Solar Superflares
• Large X-ray Flares on Stars Detected with MAXI/GSC: A Universal Correlation between the Duration of a Flare and its X-ray Luminosity
• Sun-as-a-star Analyses of Various Solar Active Events Using H$\alpha$ Spectral Images Taken by SMART/SDDI
• Discovery of a Long-Duration Superflare on a Young Solar-Type Star EK Draconis with Nearly Similar Time Evolution for H$\alpha$ and White-Light Emissions
• Radiative hydrodynamic modelling and observations of the X-class solar flare on 2011 March 9
• Unified Relationship between Cold Plasma Ejections and Flare Energies Ranging from Solar Microflares to Giant Stellar Flares

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• Time-lapse Very Long Baseline Interferometry Imaging of the Close Active Binary HR 1099
• Simulating stellar coronal rain and slingshot prominences
• X-ray and Hα superflare on an RS CVn-type star, UX Arietis: Constraint on the flare location from radial velocity change during the flare
• Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi
• HD 26172: an active solar-type subgiant in a close binary system
• A Possible Stellar CME Event Associated with a Long-duration Optical Flare on the RS CVn-type Star UX Arietis