First Resolution of a Main Sequence G-Star Astrosphere Using Chandra Article Swipe

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C. M. Lisse , S. J. Wolk , Bradford Snios , J.R. McNutt , Jonathan D. Slavin , Rachel A. Osten , Dean C. Hines , John H. Debes , Dimitra Koutroumpa , V. Kharchenko , J. L. Linsky , P. C. Brandt , M. Horányi , Hans Moritz Guenther , E. F. Guinan , Seth Redfield , P. C. Frisch , K. Dennerl , Varchaswi Kashyap , K. G. Kislyakova , Y. R. Fernández , E. Provornikova , Meredith A. MacGregor , C. H. Chen , L. J. Paxton , K. Dialynas , Liyi Gu ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2512.09613

We report resolution of a halo of X-ray line emission surrounding the Zero Age Main Sequence (ZAMS) G8.5V star HD 61005 by Chandra ACIS-S. Located only 36.4 pc distant, HD 61005 is young (approx. 100 Myr), x-ray bright (300 times Solar), observed with nearly edge-on geometry, and surrounded by Local Interstellar Medium (LISM) material denser than in the environ of the Sun. HD 61005 is known to harbor large amounts of circumstellar dust in a dense ecliptic plane full of mm-sized particles plus attached, extended wing like structures full of micron sized particles, which are evidence for a strong LISM-dust disk interaction. These properties aided our ability to resolve the 220 au wide astrosphere of HD61005, the first ever observed for a main sequence G-star. The observed x-ray emission morphology is roughly spherical, as expected for an astrospheric structure dominated by the host star. The Chandra spectrum of HD 61005 is a combination of a hard stellar coronal emission (T=8 MK) at Lx = 6 x10e29 erg per sec, plus an extended halo contribution at Lx = 1x10e29 erg per sec dominated by charge exchange (CXE) lines, such as those of OVIII and NeIX. The Chandra CXE x-ray morphology does not track the planar dust morphology but does extend out roughly to where the base of the dust wings begins. We present a toy model of x-ray emission produced by stellar wind (SW)-LISM CXE interactions, similar to the state of the young Sun when it was approximately 100 Myrs old (Guinan and Engle 2007), and transiting through an approximately 1000 times denser part of the interstellar medium (ISM) such as a Giant Molecular Cloud (Stern 2003, Opher and Loeb 2024).

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Type: preprint
Landing Page: http://arxiv.org/abs/2512.09613
PDF: https://arxiv.org/pdf/2512.09613
OA Status: green
OpenAlex ID: https://openalex.org/W4417291872

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OpenAlex ID: https://openalex.org/W4417291872

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DOI: https://doi.org/10.48550/arxiv.2512.09613

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Title: First Resolution of a Main Sequence G-Star Astrosphere Using Chandra

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Type: preprint

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Publication year: 2025

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Publication date: 2025-12-10

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Authors: C. M. Lisse, S. J. Wolk, Bradford Snios, J.R. McNutt, Jonathan D. Slavin, Rachel A. Osten, Dean C. Hines, John H. Debes, Dimitra Koutroumpa, V. Kharchenko, J. L. Linsky, P. C. Brandt, M. Horányi, Hans Moritz Guenther, E. F. Guinan, Seth Redfield, P. C. Frisch, K. Dennerl, Varchaswi Kashyap, K. G. Kislyakova, Y. R. Fernández, E. Provornikova, Meredith A. MacGregor, C. H. Chen, L. J. Paxton, K. Dialynas, Liyi Gu

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Landing page: https://arxiv.org/abs/2512.09613

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PDF URL: https://arxiv.org/pdf/2512.09613

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abstract_inverted_index.produced	228
abstract_inverted_index.sequence	123
abstract_inverted_index.spectrum	146
abstract_inverted_index.(SW)-LISM	232
abstract_inverted_index.LISM-dust	99
abstract_inverted_index.Molecular	272
abstract_inverted_index.attached,	83
abstract_inverted_index.dominated	139, 181
abstract_inverted_index.geometry,	45
abstract_inverted_index.particles	81
abstract_inverted_index.structure	138
abstract_inverted_index.morphology	129, 198, 205
abstract_inverted_index.particles,	92
abstract_inverted_index.properties	103
abstract_inverted_index.resolution	2
abstract_inverted_index.spherical,	132
abstract_inverted_index.structures	87
abstract_inverted_index.surrounded	47
abstract_inverted_index.transiting	255
abstract_inverted_index.astrosphere	113
abstract_inverted_index.combination	152
abstract_inverted_index.surrounding	10
abstract_inverted_index.Interstellar	50
abstract_inverted_index.astrospheric	137
abstract_inverted_index.contribution	173
abstract_inverted_index.interaction.	101
abstract_inverted_index.interstellar	265
abstract_inverted_index.approximately	246, 258
abstract_inverted_index.circumstellar	71
abstract_inverted_index.interactions,	234
cited_by_percentile_year
countries_distinct_count	0
institutions_distinct_count	27
citation_normalized_percentile