{"id":1292,"date":"2021-08-19T16:55:46","date_gmt":"2021-08-19T15:55:46","guid":{"rendered":"https:\/\/sites.dundee.ac.uk\/stellarnursery?post_type=papers&#038;p=1292"},"modified":"2021-08-19T16:55:46","modified_gmt":"2021-08-19T15:55:46","slug":"the-star-melt-python-package-for-emission-line-analysis-of-ysos","status":"publish","type":"papers","link":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/papers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/","title":{"rendered":"The STAR-MELT Python package for emission line analysis of YSOs"},"content":{"rendered":"<p>by <a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Campbell-White%2C+J\">Justyn Campbell-White<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Sicilia-Aguilar%2C+A\">Aurora Sicilia-Aguilar<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Manara%2C+C+F\">Carlo F. Manara<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Matsumura%2C+S\">Soko Matsumura<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Fang%2C+M\">Min Fang<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Frasca%2C+A\">Antonio Frasca<\/a>,\u00a0<a href=\"https:\/\/arxiv.org\/search\/astro-ph?searchtype=author&amp;query=Roccatagliata%2C+V\">Veronica Roccatagliata<\/a><\/p>\n<p><strong>Published in Monthly Notices of the Royal Astronomical Society, <a href=\"https:\/\/doi.org\/10.1093\/mnras\/stab2300\" target=\"_blank\" rel=\"noopener\">10 August 2021<\/a><\/strong><\/p>\n<p><strong>Abstract:<\/strong><\/p>\n<p>We introduce the STAR-MELT Python package that we developed to facilitate the analysis of time-resolved emission line spectroscopy of young stellar objects. STAR-MELT automatically extracts, identifies and fits emission lines. We summarise our analysis methods that utilises the time domain of high-resolution stellar spectra to investigate variability in the line profiles and corresponding emitting regions. This allows us to probe the innermost disc and accretion structures of YSOs. Local temperatures and densities can be determined using Boltzmann statistics, the Saha equation, and the Sobolev large velocity gradient approximation. STAR-MELT allows for new results to be obtained from archival data, as well as facilitating timely analysis of new data as it is obtained. We present the results of applying STAR-MELT to three YSOs, using spectra from UVES, XSHOOTER, FEROS, HARPS, and ESPaDOnS. We demonstrate what can be achieved for data with disparate time sampling, for stars with different inclinations and variability types. For EX Lupi, we confirm the presence of a localised and stable stellar-surface hot spot associated with the footprint of the accretion column. For GQ Lupi A, we find that the maximum infall rate from an accretion column is correlated with lines produced in the lowest temperatures. For CVSO109 we investigate the rapid temporal variability of a redshifted emission wing, indicative of rotating and infalling material in the inner disc. Our results show that STAR-MELT is a useful tool for such analysis, as well as other applications for emission lines.<\/p>\n<p><strong>More information and download <a href=\"https:\/\/arxiv.org\/abs\/2108.02552\" target=\"_blank\" rel=\"noopener\">pdf here<\/a><\/strong><\/p>\n<p><strong>Python package and Jupyter Notebook on GitHub <a href=\"https:\/\/github.com\/justyncw\/STAR_MELT\" target=\"_blank\" rel=\"noopener\">here<\/a><\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"featured_media":1293,"template":"","class_list":["post-1292","papers","type-papers","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery\" \/>\n<meta property=\"og:description\" content=\"by Justyn Campbell-White,\u00a0Aurora Sicilia-Aguilar,\u00a0Carlo F. Manara,\u00a0Soko Matsumura,\u00a0Min Fang,\u00a0Antonio Frasca,\u00a0Veronica Roccatagliata Published in Monthly Notices of the Royal Astronomical Society, 10 August 2021 Abstract: We introduce the STAR-MELT Python package that we developed to facilitate the analysis of time-resolved emission line spectroscopy of young stellar objects. STAR-MELT automatically extracts, identifies and fits emission lines. We summarise [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/\" \/>\n<meta property=\"og:site_name\" content=\"The Stellar Nursery\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites.dundee.ac.uk\/wp-content\/uploads\/sites\/280\/2021\/08\/Star-melt-logo-sq.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1051\" \/>\n\t<meta property=\"og:image:height\" content=\"1051\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/\",\"url\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/\",\"name\":\"The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/wp-content\\\/uploads\\\/sites\\\/280\\\/2021\\\/08\\\/Star-melt-logo-sq.jpg\",\"datePublished\":\"2021-08-19T15:55:46+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/#primaryimage\",\"url\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/wp-content\\\/uploads\\\/sites\\\/280\\\/2021\\\/08\\\/Star-melt-logo-sq.jpg\",\"contentUrl\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/wp-content\\\/uploads\\\/sites\\\/280\\\/2021\\\/08\\\/Star-melt-logo-sq.jpg\",\"width\":1051,\"height\":1051,\"caption\":\"Star Melt Logo Sq\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypapers\\\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Papers\",\"item\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnurserypublished-papers\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"The STAR-MELT Python package for emission line analysis of YSOs\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/#website\",\"url\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/\",\"name\":\"The Stellar Nursery\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/sites.dundee.ac.uk\\\/stellarnursery\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-GB\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/","og_locale":"en_GB","og_type":"article","og_title":"The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery","og_description":"by Justyn Campbell-White,\u00a0Aurora Sicilia-Aguilar,\u00a0Carlo F. Manara,\u00a0Soko Matsumura,\u00a0Min Fang,\u00a0Antonio Frasca,\u00a0Veronica Roccatagliata Published in Monthly Notices of the Royal Astronomical Society, 10 August 2021 Abstract: We introduce the STAR-MELT Python package that we developed to facilitate the analysis of time-resolved emission line spectroscopy of young stellar objects. STAR-MELT automatically extracts, identifies and fits emission lines. We summarise [&hellip;]","og_url":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/","og_site_name":"The Stellar Nursery","og_image":[{"width":1051,"height":1051,"url":"https:\/\/sites.dundee.ac.uk\/wp-content\/uploads\/sites\/280\/2021\/08\/Star-melt-logo-sq.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Estimated reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/","url":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/","name":"The STAR-MELT Python package for emission line analysis of YSOs - The Stellar Nursery","isPartOf":{"@id":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/#website"},"primaryImageOfPage":{"@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/#primaryimage"},"image":{"@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/#primaryimage"},"thumbnailUrl":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-content\/uploads\/sites\/280\/2021\/08\/Star-melt-logo-sq.jpg","datePublished":"2021-08-19T15:55:46+00:00","breadcrumb":{"@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/#primaryimage","url":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-content\/uploads\/sites\/280\/2021\/08\/Star-melt-logo-sq.jpg","contentUrl":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-content\/uploads\/sites\/280\/2021\/08\/Star-melt-logo-sq.jpg","width":1051,"height":1051,"caption":"Star Melt Logo Sq"},{"@type":"BreadcrumbList","@id":"https:\/\/sites.dundee.ac.uk\/stellarnurserypapers\/the-star-melt-python-package-for-emission-line-analysis-of-ysos\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/sites.dundee.ac.uk\/stellarnursery"},{"@type":"ListItem","position":2,"name":"Papers","item":"https:\/\/sites.dundee.ac.uk\/stellarnurserypublished-papers\/"},{"@type":"ListItem","position":3,"name":"The STAR-MELT Python package for emission line analysis of YSOs"}]},{"@type":"WebSite","@id":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/#website","url":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/","name":"The Stellar Nursery","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-GB"}]}},"_links":{"self":[{"href":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-json\/wp\/v2\/papers\/1292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-json\/wp\/v2\/papers"}],"about":[{"href":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-json\/wp\/v2\/types\/papers"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-json\/wp\/v2\/media\/1293"}],"wp:attachment":[{"href":"https:\/\/sites.dundee.ac.uk\/stellarnursery\/wp-json\/wp\/v2\/media?parent=1292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}