MASCARA

{{main|MASCARA-1b}}

On 17 July 2017, the discovery of MASCARA-1b, a confirmed superjovian exoplanet with a mass 3.7{{Jupiter_mass}}, was reported by the survey team. MASCARA-1b is a hot Jupiter transiting its parent A-type star; its orbit is misaligned with the star's rotation. The planet was found unusually reflective for hot Jupiter with the measured geometric albedo of 0.171{{±|0.066|0.068}} and dayside temperature of 3062{{±|66|68}} K.{{citation|arxiv=2109.05031|year=2022|title=Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection|doi=10.1051/0004-6361/202141645 |last1=Hooton |first1=M. J. |last2=Hoyer |first2=S. |last3=Kitzmann |first3=D. |last4=Morris |first4=B. M. |last5=Smith |first5=A. M. S. |last6=Collier Cameron |first6=A. |last7=Futyan |first7=D. |last8=Maxted |first8=P. F. L. |last9=Queloz |first9=D. |last10=Demory |first10=B.-O. |last11=Heng |first11=K. |last12=Lendl |first12=M. |last13=Cabrera |first13=J. |last14=Csizmadia |first14=Sz. |last15=Deline |first15=A. |last16=Parviainen |first16=H. |last17=Salmon |first17=S. |last18=Sulis |first18=S. |last19=Wilson |first19=T. G. |last20=Bonfanti |first20=A. |last21=Brandeker |first21=A. |last22=Demangeon |first22=O. D. S. |last23=Oshagh |first23=M. |last24=Persson |first24=C. M. |last25=Scandariato |first25=G. |last26=Alibert |first26=Y. |last27=Alonso |first27=R. |last28=Anglada Escudé |first28=G. |last29=Bárczy |first29=T. |last30=Barrado |first30=D. |journal=Astronomy & Astrophysics |volume=658 |pages=A75 |bibcode=2022A&A...658A..75H |display-authors=1 }} Attempts to spectroscopically characterize its composition were failing as in 2022 due to relatively high planetary surface gravity resulting in compact atmosphere.{{citation|arxiv=2206.09443|year=2022|title=Transmission spectroscopy of MASCARA-1b with ESPRESSO: Challenges of overlapping orbital and Doppler tracks|doi=10.1051/0004-6361/202143016 |last1=Casasayas-Barris |first1=N. |last2=Borsa |first2=F. |last3=Palle |first3=E. |last4=Allart |first4=R. |last5=Bourrier |first5=V. |last6=Gonzalez Hernandez |first6=J. I. |last7=Kesseli |first7=A. |last8=Sánchez-López |first8=A. |last9=Zapatero Osorio |first9=M. R. |last10=Snellen |first10=I. A. G. |last11=Orell-Miquel |first11=J. |last12=Stangret |first12=M. |last13=Esparza-Borges |first13=E. |last14=Lovis |first14=C. |last15=Hooton |first15=M. J. |last16=Lend |first16=M. |last17=Smith |first17=A. M. S. |last18=Pepe |first18=F. |last19=Rebolo |first19=R. |last20=Cristiani |first20=S. |last21=Santos |first21=N. C. |last22=Adibekyan |first22=V. |last23=Alibert |first23=Y. |last24=Cristo |first24=E. |last25=Demangeon |first25=O. D. S. |last26=Figueira |first26=P. |last27=Di Marcantonio |first27=P. |last28=Martins |first28=C. J. A. P. |last29=Micela |first29=G. |last30=Seidel |first30=J. V. |journal=Astronomy & Astrophysics |volume=664 |pages=A121 |bibcode=2022A&A...664A.121C |display-authors=1 }}

{{main|KELT-20b}}

A second planet, MASCARA-2b, also known as KELT-20b, was also announced in 2017. It is a hot Jupiter orbiting an A-type star. The carbon monoxide, steam{{citation|arxiv=2201.02261|year=2022|title=Strong H₂O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation|doi=10.3847/2041-8213/ac4968 |doi-access=free |last1=Fu |first1=Guangwei |last2=Sing |first2=David K. |last3=Lothringer |first3=Joshua D. |last4=Deming |first4=Drake |last5=Ih |first5=Jegug |last6=Kempton |first6=Eliza M. -R. |last7=Malik |first7=Matej |last8=Komacek |first8=Thaddeus D. |last9=Mansfield |first9=Megan |last10=Bean |first10=Jacob L. |journal=The Astrophysical Journal Letters |volume=925 |issue=1 |pages=L3 |bibcode=2022ApJ...925L...3F }}{{citation|arxiv=2208.04759|year=2023|title=Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b|doi=10.3847/1538-3881/ac9f40 |doi-access=free |last1=Kasper |first1=David |last2=Bean |first2=Jacob L. |last3=Line |first3=Michael R. |last4=Seifahrt |first4=Andreas |last5=Brady |first5=Madison T. |last6=Lothringer |first6=Joshua |last7=Pino |first7=Lorenzo |last8=Fu |first8=Guangwei |last9=Pelletier |first9=Stefan |last10=Stürmer |first10=Julian |last11=Benneke |first11=Björn |last12=Brogi |first12=Matteo |last13=Désert |first13=Jean-Michel |journal=The Astronomical Journal |volume=165 |issue=1 |page=7 |bibcode=2023AJ....165....7K }} and neutral iron{{citation|arxiv=2201.08759|year=2022|title=Detection of iron emission lines and a temperature inversion on the dayside of the ultra-hot Jupiter KELT-20b|doi=10.1051/0004-6361/202142395 |last1=Yan |first1=F. |last2=Reiners |first2=A. |last3=Pallé |first3=E. |last4=Shulyak |first4=D. |last5=Stangret |first5=M. |last6=Molaverdikhani |first6=K. |last7=Nortmann |first7=L. |last8=Mollière |first8=P. |last9=Henning |first9=Th. |last10=Casasayas-Barris |first10=N. |last11=Cont |first11=D. |last12=Chen |first12=G. |last13=Czesla |first13=S. |last14=Sánchez-López |first14=A. |last15=López-Puertas |first15=M. |last16=Ribas |first16=I. |last17=Quirrenbach |first17=A. |last18=Caballero |first18=J. A. |last19=Amado |first19=P. J. |last20=Galadí-Enríquez |first20=D. |last21=Khalafinejad |first21=S. |last22=Lara |first22=L. M. |last23=Montes |first23=D. |last24=Morello |first24=G. |last25=Nagel |first25=E. |last26=Sedaghati |first26=E. |last27=Zapatero Osorio |first27=M. R. |last28=Zechmeister |first28=M. |journal=Astronomy & Astrophysics |volume=659 |pages=A7 |bibcode=2022A&A...659A...7Y }} detection in the atmosphere of MASCARA-2b was announced in 2022.

{{main|HD 85628 Ab}}

A planet MASCARA-4b (also known as HD 85628 Ab) discovery was announced in 2019. It is a hot Jupiter on retrograde and slightly eccentric orbit.{{citation|arxiv=1904.02733|year=2019|title=MASCARA-4 b/BRing-1 b: A retrograde hot Jupiter around a bright A-type star|doi=10.1051/0004-6361/201935611 |last1=Dorval |first1=P. |last2=Talens |first2=G. J. J. |last3=Otten |first3=G. P. P. L. |last4=Brahm |first4=R. |last5=Jordán |first5=A. |last6=Torres |first6=P. |last7=Vanzi |first7=L. |last8=Zapata |first8=A. |last9=Henry |first9=T. |last10=Paredes |first10=L. |last11=Jao |first11=W. C. |last12=James |first12=H. |last13=Hinojosa |first13=R. |last14=Bakos |first14=G. A. |last15=Csubry |first15=Z. |last16=Bhatti |first16=W. |last17=Suc |first17=V. |last18=Osip |first18=D. |last19=Mamajek |first19=E. E. |last20=Mellon |first20=S. N. |last21=Wyttenbach |first21=A. |last22=Stuik |first22=R. |last23=Kenworthy |first23=M. |last24=Bailey |first24=J. |last25=Ireland |first25=M. |last26=Crawford |first26=S. |last27=Lomberg |first27=B. |last28=Kuhn |first28=R. |last29=Snellen |first29=I. |journal=Astronomy & Astrophysics |volume=635 |pages=A60 }} The planet is unusually reflective for a hot Jupiter.{{citation|arxiv=1911.05025|year=2019|title=Gravity-darkening Analysis of the Misaligned Hot Jupiter MASCARA-4 B|doi=10.3847/1538-4357/ab59d0 |doi-access=free |last1=Ahlers |first1=John P. |last2=Kruse |first2=Ethan |last3=Colón |first3=Knicole D. |last4=Dorval |first4=Patrick |last5=Talens |first5=Geert Jan |last6=Snellen |first6=Ignas |last7=Albrecht |first7=Simon |last8=Otten |first8=Gilles |last9=Ricker |first9=George |last10=Vanderspek |first10=Roland |last11=Latham |first11=David |last12=Seager |first12=Sara |last13=Winn |first13=Joshua |last14=Jenkins |first14=Jon M. |last15=Haworth |first15=Kari |last16=Cartwright |first16=Scott |last17=Morris |first17=Robert |last18=Rowden |first18=Pam |last19=Tenenbaum |first19=Peter |last20=Ting |first20=Eric B. |journal=The Astrophysical Journal |volume=888 |issue=2 |page=63 }} Hydrogen, sodium, magnesium, calcium and iron emission from planetary atmosphere was detected.{{citation|arxiv=2208.11427|year=2022|title=Transmission spectroscopy of the ultra-hot Jupiter MASCARA-4 B|doi=10.1051/0004-6361/202244203 |last1=Zhang |first1=Yapeng |last2=Snellen |first2=Ignas A. G. |last3=Wyttenbach |first3=Aurèlien |last4=Nielsen |first4=Louise D. |last5=Lendl |first5=Monika |last6=Casasayas-Barris |first6=Núria |last7=Chaverot |first7=Guillaume |last8=Kesseli |first8=Aurora Y. |last9=Lovis |first9=Christophe |last10=Pepe |first10=Francesco A. |last11=Psaridi |first11=Angelica |last12=Seidel |first12=Julia V. |last13=Udry |first13=Stéphane |last14=Ulmer-Moll |first14=Solène |journal=Astronomy & Astrophysics |volume=666 |pages=A47 }}

{{main|TOI-1431 b}}

In 2021, a planet MASCARA-5b (more commonly known as TOI-1431 b), is an Ultra-hot Jupiter. Its dayside temperature is 2,700 K (2,427 °C), making it hotter than 40% of stars in our galaxy.{{cite news |title=Scientists uncover a 'hellish' planet so hot it could vaporize most metals |url=https://www.cnet.com/news/scientists-uncover-a-hellish-planet-so-hot-it-could-vaporize-most-metals/ |date=April 27, 2021 |work=CNET|accessdate=April 27, 2021 }} The nightside temperature is 2,600 K (2,300 °C).{{cite news |title='Hellish' new planet discovered |url=https://www.usq.edu.au/news/2021/04/hellish-new-planet |date=April 27, 2021 |work=University of Southern Queensland|accessdate=April 27, 2021 }}

{{reflist|30em|refs=

{{cite web

|title = Eyes Wide Open for MASCARA in Chile – Exoplanet hunter sees first light at ESO's La Silla Observatory

|work = European Southern Observatory

|url = http://www.eso.org/public/news/eso1722/

|date = 19 July 2017

|accessdate = 26 July 2017}}

{{cite web

|title = Eyes Wide Open for MASCARA in Chile – Exoplanet hunter sees first light at ESO's La Silla Observatory

|work = European Southern Observatory

|url = http://www.eso.org/public/unitedkingdom/teles-instr/lasilla/mascara/

|accessdate = 26 July 2017}}

{{cite web

|title = Multi-site All-Sky CAmeRA – Official Website

|work = Leiden Astronomy MASCARA group

|url = http://mascara1.strw.leidenuniv.nl/

|accessdate = 26 July 2017}}

{{cite journal

|bibcode=2017A&A...606A..73T

|doi=10.1051/0004-6361/201731282

|arxiv=1707.04262|title=MASCARA-1 b. A hot Jupiter transiting a bright m_V = 8.3 A-star in a misaligned orbit

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|volume=606

|pages=A73

|year=2017

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|bibcode=2018A&A...612A..57T

|doi=10.1051/0004-6361/201731512

|arxiv=1707.01500|title=MASCARA-2 b: A hot Jupiter transiting a m_V = 7.6 A-star

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}}

• G.J.J. Talens et al., The Multi-site All-Sky CAmeRA: Finding transiting exoplanets around bright (m_V < 8) stars, accepted for publication in A&A {{arXiv|1702.03931}}

• [http://mascara1.strw.leidenuniv.nl MASCARA website] at Leiden University
• [http://www.eso.org/public/teles-instr/lasilla/mascara/ MASCARA], ESO

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