GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

Christian R. Hayes; Kim A. Venn; Fletcher Waller; Jaclyn Jensen; Alan W. McConnachie; John Pazder; Federico Sestito; André Anthony; Gabriella Baker; John Bassett; Joao Bento; Trystyn Berg; Gregory Burley; Jurek Brzeski; Scott Case; Edward Chapin; Timothy Chin; Eric Chisholm; Vladimir Churilov; Adam Densmore; Ruben Diaz; Jennifer Dunn; Michael Edgar; Tony Farrell; Veronica Firpo; Joeleff Fitzsimmons; Juan Font-Serra; Javier Fuentes; Colin Ganton; Manuel Gomez-Jimenez; Tim Hardy; David Henderson; Alexis Hill; Brian Hoff; Michael Ireland; Venu Kalari; Neal Kelly; Urs Klauser; Yuriy Kondrat; Kathleen Labrie; Sam Lambert; Lance Luvaul; Jon Lawrence; Jordan Lothrop; G. Scott Macdonald; Slavko Mali; Steve Margheim; Richard McDermid; Helen McGregor; Bryan Miller; Felipe Miranda; Rolf Muller; Jon Nielsen; Ryan Norbury; Oliver Oberdorf; Naveen Pai; Gabriel Perez; Pablo Prado; Ian Price; Carlos Quiroz; Vladimir Reshetov; Gordon Robertson; Roque Ruiz-Carmona; Ricardo Salinas; Kim M. Sebo; Andrew Sheinis; Matthew Shetrone; Keith Shortridge; Katherine Silversides; Karleyne Silva; Chris Simpson; Greg Smith; Kei Szeto; Julia Tims; Eduardo Toro; Cristian Urrutia; Sudharshan Venkatesan; Lewis Waller; Ivan Wevers; Ramunas Wierzbicki; Marc White; Peter Young; Ross Zhelem

doi:10.3847/1538-4357/acebc0

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

Christian R. Hayes^*, Kim A. Venn, Fletcher Waller, Jaclyn Jensen, Alan W. McConnachie, John Pazder, Federico Sestito, André Anthony, Gabriella Baker, John Bassett, Joao Bento, Trystyn Berg, Gregory Burley, Jurek Brzeski, Scott Case, Edward Chapin, Timothy Chin, Eric Chisholm, Vladimir Churilov, Adam DensmoreRuben Diaz, Jennifer Dunn, Michael Edgar, Tony Farrell, Veronica Firpo, Joeleff Fitzsimmons, Juan Font-Serra, Javier Fuentes, Colin Ganton, Manuel Gomez-Jimenez, Tim Hardy, David Henderson, Alexis Hill, Brian Hoff, Michael Ireland, Venu Kalari, Neal Kelly, Urs Klauser, Yuriy Kondrat, Kathleen Labrie, Sam Lambert, Lance Luvaul, Jon Lawrence, Jordan Lothrop, G. Scott Macdonald, Slavko Mali, Steve Margheim, Richard McDermid, Helen McGregor, Bryan Miller, Felipe Miranda, Rolf Muller, Jon Nielsen, Ryan Norbury, Oliver Oberdorf, Naveen Pai, Gabriel Perez, Pablo Prado, Ian Price, Carlos Quiroz, Vladimir Reshetov, Gordon Robertson, Roque Ruiz-Carmona, Ricardo Salinas, Kim M. Sebo, Andrew Sheinis, Matthew Shetrone, Keith Shortridge, Katherine Silversides, Karleyne Silva, Chris Simpson, Greg Smith, Kei Szeto, Julia Tims, Eduardo Toro, Cristian Urrutia, Sudharshan Venkatesan, Lewis Waller, Ivan Wevers, Ramunas Wierzbicki, Marc White, Peter Young, Ross Zhelem

^*Corresponding author for this work

Advanced Instrumentation and Technology Centre

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret ii), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret ii, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret ii stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

Original language	English
Article number	17
Journal	Astrophysical Journal
Volume	955
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/acebc0
Publication status	Published - 1 Sept 2023

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Hayes, C. R., Venn, K. A., Waller, F., Jensen, J., McConnachie, A. W., Pazder, J., Sestito, F., Anthony, A., Baker, G., Bassett, J., Bento, J., Berg, T., Burley, G., Brzeski, J., Case, S., Chapin, E., Chin, T., Chisholm, E., Churilov, V., ... Zhelem, R. (2023). GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II. Astrophysical Journal, 955(1), Article 17. https://doi.org/10.3847/1538-4357/acebc0

@article{a70ab9ef8e5a492b98c29bc0d5b1c938,

title = "GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II",

abstract = "The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret ii), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret ii, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret ii stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.",

author = "Hayes, {Christian R.} and Venn, {Kim A.} and Fletcher Waller and Jaclyn Jensen and McConnachie, {Alan W.} and John Pazder and Federico Sestito and Andr{\'e} Anthony and Gabriella Baker and John Bassett and Joao Bento and Trystyn Berg and Gregory Burley and Jurek Brzeski and Scott Case and Edward Chapin and Timothy Chin and Eric Chisholm and Vladimir Churilov and Adam Densmore and Ruben Diaz and Jennifer Dunn and Michael Edgar and Tony Farrell and Veronica Firpo and Joeleff Fitzsimmons and Juan Font-Serra and Javier Fuentes and Colin Ganton and Manuel Gomez-Jimenez and Tim Hardy and David Henderson and Alexis Hill and Brian Hoff and Michael Ireland and Venu Kalari and Neal Kelly and Urs Klauser and Yuriy Kondrat and Kathleen Labrie and Sam Lambert and Lance Luvaul and Jon Lawrence and Jordan Lothrop and Macdonald, {G. Scott} and Slavko Mali and Steve Margheim and Richard McDermid and Helen McGregor and Bryan Miller and Felipe Miranda and Rolf Muller and Jon Nielsen and Ryan Norbury and Oliver Oberdorf and Naveen Pai and Gabriel Perez and Pablo Prado and Ian Price and Carlos Quiroz and Vladimir Reshetov and Gordon Robertson and Roque Ruiz-Carmona and Ricardo Salinas and Sebo, {Kim M.} and Andrew Sheinis and Matthew Shetrone and Keith Shortridge and Katherine Silversides and Karleyne Silva and Chris Simpson and Greg Smith and Kei Szeto and Julia Tims and Eduardo Toro and Cristian Urrutia and Sudharshan Venkatesan and Lewis Waller and Ivan Wevers and Ramunas Wierzbicki and Marc White and Peter Young and Ross Zhelem",

note = "Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",

year = "2023",

month = sep,

day = "1",

doi = "10.3847/1538-4357/acebc0",

language = "English",

volume = "955",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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Hayes, CR, Venn, KA, Waller, F, Jensen, J, McConnachie, AW, Pazder, J, Sestito, F, Anthony, A, Baker, G, Bassett, J, Bento, J, Berg, T, Burley, G, Brzeski, J, Case, S, Chapin, E, Chin, T, Chisholm, E, Churilov, V, Densmore, A, Diaz, R, Dunn, J, Edgar, M, Farrell, T, Firpo, V, Fitzsimmons, J, Font-Serra, J, Fuentes, J, Ganton, C, Gomez-Jimenez, M, Hardy, T, Henderson, D, Hill, A, Hoff, B, Ireland, M, Kalari, V, Kelly, N, Klauser, U, Kondrat, Y, Labrie, K, Lambert, S, Luvaul, L, Lawrence, J, Lothrop, J, Macdonald, GS, Mali, S, Margheim, S, McDermid, R, McGregor, H, Miller, B, Miranda, F, Muller, R, Nielsen, J, Norbury, R, Oberdorf, O, Pai, N, Perez, G, Prado, P, Price, I, Quiroz, C, Reshetov, V, Robertson, G, Ruiz-Carmona, R, Salinas, R, Sebo, KM, Sheinis, A, Shetrone, M, Shortridge, K, Silversides, K, Silva, K, Simpson, C, Smith, G, Szeto, K, Tims, J, Toro, E, Urrutia, C, Venkatesan, S, Waller, L, Wevers, I, Wierzbicki, R, White, M, Young, P & Zhelem, R 2023, 'GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II', Astrophysical Journal, vol. 955, no. 1, 17. https://doi.org/10.3847/1538-4357/acebc0

TY - JOUR

T1 - GHOST Commissioning Science Results

T2 - Identifying a New Chemically Peculiar Star in Reticulum II

AU - Hayes, Christian R.

AU - Venn, Kim A.

AU - Waller, Fletcher

AU - Jensen, Jaclyn

AU - McConnachie, Alan W.

AU - Pazder, John

AU - Sestito, Federico

AU - Anthony, André

AU - Baker, Gabriella

AU - Bassett, John

AU - Bento, Joao

AU - Berg, Trystyn

AU - Burley, Gregory

AU - Brzeski, Jurek

AU - Case, Scott

AU - Chapin, Edward

AU - Chin, Timothy

AU - Chisholm, Eric

AU - Churilov, Vladimir

AU - Densmore, Adam

AU - Diaz, Ruben

AU - Dunn, Jennifer

AU - Edgar, Michael

AU - Farrell, Tony

AU - Firpo, Veronica

AU - Fitzsimmons, Joeleff

AU - Font-Serra, Juan

AU - Fuentes, Javier

AU - Ganton, Colin

AU - Gomez-Jimenez, Manuel

AU - Hardy, Tim

AU - Henderson, David

AU - Hill, Alexis

AU - Hoff, Brian

AU - Ireland, Michael

AU - Kalari, Venu

AU - Kelly, Neal

AU - Klauser, Urs

AU - Kondrat, Yuriy

AU - Labrie, Kathleen

AU - Lambert, Sam

AU - Luvaul, Lance

AU - Lawrence, Jon

AU - Lothrop, Jordan

AU - Macdonald, G. Scott

AU - Mali, Slavko

AU - Margheim, Steve

AU - McDermid, Richard

AU - McGregor, Helen

AU - Miller, Bryan

AU - Miranda, Felipe

AU - Muller, Rolf

AU - Nielsen, Jon

AU - Norbury, Ryan

AU - Oberdorf, Oliver

AU - Pai, Naveen

AU - Perez, Gabriel

AU - Prado, Pablo

AU - Price, Ian

AU - Quiroz, Carlos

AU - Reshetov, Vladimir

AU - Robertson, Gordon

AU - Ruiz-Carmona, Roque

AU - Salinas, Ricardo

AU - Sebo, Kim M.

AU - Sheinis, Andrew

AU - Shetrone, Matthew

AU - Shortridge, Keith

AU - Silversides, Katherine

AU - Silva, Karleyne

AU - Simpson, Chris

AU - Smith, Greg

AU - Szeto, Kei

AU - Tims, Julia

AU - Toro, Eduardo

AU - Urrutia, Cristian

AU - Venkatesan, Sudharshan

AU - Waller, Lewis

AU - Wevers, Ivan

AU - Wierzbicki, Ramunas

AU - White, Marc

AU - Young, Peter

AU - Zhelem, Ross

PY - 2023/9/1

Y1 - 2023/9/1

N2 - The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret ii), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret ii, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret ii stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

AB - The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret ii), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret ii, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret ii stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

UR - http://www.scopus.com/inward/record.url?scp=85172771960&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/acebc0

DO - 10.3847/1538-4357/acebc0

M3 - Article

SN - 0004-637X

VL - 955

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 17

ER -

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

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