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There has been growing evidence in the literature that M-dwarf stars suffer radius inflation compared to theoretical models, suggesting that models are missing some key physics required to completely describe stars at effective temperatures less than about 4000K. We presented evidence at the previous Cool Stars meeting that this problem is evident in pre-main sequence populations within stellar clusters. With the advent of Gaia DR2, we have been able to generalise our novel SED fitting methodology, which relies only upon multiband photometry and geometric distances, to measure the radii of >15,000 nearby main-sequence field M-dwarf stars, and show that radius inflation persists onto the main sequence. From this sample, we have determined that M-dwarfs show an inflation of 3 - 7 per cent from the purely theoretical models, with no more than 1 - 2 per cent intrinsic spread in the inflated sequence. We show that this measurement technique is able to measure M-dwarf radii to an accuracy of 2.4 per cent, however we determined that this is limited by the precision of metallicity measurements; which contribute 1.7 per cent to measurement uncertainty. We also present evidence that stellar magnetism is currently unable to explain the radius inflation in M-dwarfs.
", "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2021-02-26", "publisher": "Zenodo", "references": [ { "reference": "Stauffer J. R., et al., 2007, ApJS, 172, 663" }, { "reference": "Bell C. P. M., Naylor T., Mayne N. J., Jeffries R. D., Littlefair S. P., 2012, MNRAS, 424, 3178" }, { "reference": "Boyajian T. S. et al., 2012, ApJ, 757, 112" }, { "reference": "Mann A. W., Feiden G. A., Gaidos E., Boyajian T., von Braun K., 2015,ApJ, 804, 64" }, { "reference": "Bailer-Jones C. A. L., Rybizki J., Fouesneau M., Mantelet G., Andrae R., 2018, AJ, 156, 58" }, { "reference": "Morrell S., Naylor T., 2019, MNRAS, 489, 2615" }, { "reference": "Morrell S., Naylor T., 2020, MNRAS, 498, 5048" }, { "reference": "Dotter A., Chaboyer B., Jevremovi\u00b4c D., Kostov V., Baron E., Ferguson J. W., 2008, ApJS, 178, 89" }, { "reference": "Southworth J., 2015, in Rucinski S.M., Torres G., ZejdaM., eds, ASP Conf. Ser., Vol. 496. Living Together: Planets, Host Stars and Binaries. Astron.Soc. Pac., San Francisco, p. 164" }, { "reference": "Parsons S. G. et al., 2018, MNRAS, 481, 1083" }, { "reference": "Terrien R. C.,Mahadevan S., Deshpande R., Bender C. F., 2015, ApJS, 220, 16" }, { "reference": "Gaidos E. et al., 2014, MNRAS, 443, 2561" } ], "resource_type": { "id": "video", "title": { "de": "Video/Audio", "en": "Video/Audio" } }, "rights": [ { "description": { "en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited." }, "icon": "cc-by-icon", "id": "cc-by-4.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/licenses/by/4.0/legalcode" }, "title": { "en": "Creative Commons Attribution 4.0 International" } } ], "subjects": [ { "subject": "Cool Stars on the main sequence" } ], "title": "Exploring the M-dwarf Luminosity--Temperature--Radius Relationships using Gaia DR2", "version": "1.0" }, "parent": { "access": { "owned_by": { "user": 53946 } }, "communities": { "default": "3a36ebe6-61f3-417e-a308-74ef84ccb263", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2021-01-13T17:28:36.286355+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "3a36ebe6-61f3-417e-a308-74ef84ccb263", "links": {}, "metadata": { "curation_policy": "Contributions are accepted from participants that presented invited plenary session reviews, contributed plenary session talks, short "Haiku" talks and contributed posters. In addition, individual and collective contributions from (parallel) Topical Interest Rooms are welcome. If you would like to submit a typical conference proceeding, there are no formal page limits. For guidance we recommend you limit yourself to 4-8 pages for contributed talks and 10-15 pages for invited talks. Those wishing to submit a written conference proceeding are encouraged to format the document using the CS20 LaTeX template (available on https://github.com/CoolStars20/proceedings/releases/latest). All such submissions should be made as PDFs and will be reviewed for content by the SOC and we may suggest edits.
\r\n\r\nSubmission of presentation slides from speakers and full posters are also encouraged. PDF versions of these documents are the preferred format for Zenodo contributions to permit the documents to be previewed in a web browser. For maximum impact, a written contribution may be provided with presentation slides and/or a poster to provide greater context. Contributions will be checked for the proper metadata. Instructions about how to prepare your contribution are available on http://coolstars20.cfa.harvard.edu/contributions.html
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