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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2502.19961 |
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| _version_ | 1866916781602373632 |
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| author | Hayoz, Jean Bonse, Markus Johannes Dannert, Felix Garvin, Emily Omaya Cugno, Gabriele Patapis, Polychronis Gebhard, Timothy D. Balmer, William O. De Rosa, Robert J. Berbel, Alexander Agudo Cao, Yixian de Xivry, Gilles Orban Stolker, Tomas Davies, Richard Absil, Olivier Schmid, Hans Martin Quanz, Sascha Patrick Agapito, Guido Baruffolo, Andrea Black, Martin Bonaglia, Marco Briguglio, Runa Carbonaro, Luca Cresci, Giovanni Dallilar, Yigit Deysenroth, Matthias Di Antonio, Ivan Di Cianno, Amico Di Rico, Gianluca Doelman, David Dolci, Mauro Eisenhauer, Frank Esposito, Simone Fantinel, Daniela Ferruzzi, Debora Feuchtgruber, Helmut Förster-Schreiber, Natascha Gao, Xiaofeng Genzel, Reinhard Gillessen, Stefan Glauser, Adrian Grani, Paolo Hartl, Michael Henry, David Huber, Heinrich Keller, Christoph Kenworthy, Matthew Kravchenko, Kateryna Lightfoot, John Lunney, David Lutz, Dieter Macintosh, Mike Manucci, Filippo Ott, Thomas Pearson, David Puglisi, Alfio Rabien, Sebastian Rau, Christian Riccardi, Armando Salasnich, Bernardo Shimizu, Taro Snik, Frans Sturm, Eckhard Tacconi, Linda Taylor, William Valentini, Angelo Waring, Christopher Wiezorrek, Erich Xompero, Marco |
| author_facet | Hayoz, Jean Bonse, Markus Johannes Dannert, Felix Garvin, Emily Omaya Cugno, Gabriele Patapis, Polychronis Gebhard, Timothy D. Balmer, William O. De Rosa, Robert J. Berbel, Alexander Agudo Cao, Yixian de Xivry, Gilles Orban Stolker, Tomas Davies, Richard Absil, Olivier Schmid, Hans Martin Quanz, Sascha Patrick Agapito, Guido Baruffolo, Andrea Black, Martin Bonaglia, Marco Briguglio, Runa Carbonaro, Luca Cresci, Giovanni Dallilar, Yigit Deysenroth, Matthias Di Antonio, Ivan Di Cianno, Amico Di Rico, Gianluca Doelman, David Dolci, Mauro Eisenhauer, Frank Esposito, Simone Fantinel, Daniela Ferruzzi, Debora Feuchtgruber, Helmut Förster-Schreiber, Natascha Gao, Xiaofeng Genzel, Reinhard Gillessen, Stefan Glauser, Adrian Grani, Paolo Hartl, Michael Henry, David Huber, Heinrich Keller, Christoph Kenworthy, Matthew Kravchenko, Kateryna Lightfoot, John Lunney, David Lutz, Dieter Macintosh, Mike Manucci, Filippo Ott, Thomas Pearson, David Puglisi, Alfio Rabien, Sebastian Rau, Christian Riccardi, Armando Salasnich, Bernardo Shimizu, Taro Snik, Frans Sturm, Eckhard Tacconi, Linda Taylor, William Valentini, Angelo Waring, Christopher Wiezorrek, Erich Xompero, Marco |
| contents | The Enhanced Resolution Imager and Spectrograph (ERIS) is the new Adaptive-Optics (AO) assisted Infrared instrument at the Very Large Telescope (VLT). Its refurbished Integral Field Spectrograph (IFS) SPIFFIER leverages a new AO module, enabling high-contrast imaging applications and giving access to the orbital and atmospheric characterisation of super-Jovian exoplanets. We test the detection limits of ERIS and demonstrate its scientific potential by exploring the atmospheric composition of the young super-Jovian AF Lep b and improving its orbital solution by measuring its radial velocity relative to its host star. We present new spectroscopic observations of AF Lep b in $K$-band at $R\sim 11000$ obtained with ERIS/SPIFFIER at the VLT. We reduce the data using the standard pipeline together with a custom wavelength calibration routine, and remove the stellar PSF using principal component analysis along the spectral axis. We compute molecular maps by cross-correlating the residuals with molecular spectral templates and measure the radial velocity of the planet relative to the star. Furthermore, we compute contrast grids for molecular mapping by injecting fake planets. We detect a strong signal from H$_{2}$O and CO but not from CH$_{4}$ or CO$_{2}$. This result corroborates the hypothesis of chemical disequilibrium in the atmosphere of AF Lep b. Our measurement of the RV of the planet yields $Δv_{\mathrm{R,P\star}} = 7.8 \pm 1.7$ km s$^{-1}$. This enables us to disentangle the degeneracy of the orbital solution, namely the correct longitude of the ascending node is $Ω=248^{+0.4}_{-0.7}$ deg and the argument of periapsis is $ω=109^{+13}_{-21}$ deg. Our results demonstrate the competitiveness of the new ERIS/SPIFFIER instrument for the orbital and atmospheric characterisation of exoplanets at high contrast and small angular separation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19961 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-contrast spectroscopy with the new VLT/ERIS instrument: Molecular maps and radial velocity of the gas giant AF Lep b Hayoz, Jean Bonse, Markus Johannes Dannert, Felix Garvin, Emily Omaya Cugno, Gabriele Patapis, Polychronis Gebhard, Timothy D. Balmer, William O. De Rosa, Robert J. Berbel, Alexander Agudo Cao, Yixian de Xivry, Gilles Orban Stolker, Tomas Davies, Richard Absil, Olivier Schmid, Hans Martin Quanz, Sascha Patrick Agapito, Guido Baruffolo, Andrea Black, Martin Bonaglia, Marco Briguglio, Runa Carbonaro, Luca Cresci, Giovanni Dallilar, Yigit Deysenroth, Matthias Di Antonio, Ivan Di Cianno, Amico Di Rico, Gianluca Doelman, David Dolci, Mauro Eisenhauer, Frank Esposito, Simone Fantinel, Daniela Ferruzzi, Debora Feuchtgruber, Helmut Förster-Schreiber, Natascha Gao, Xiaofeng Genzel, Reinhard Gillessen, Stefan Glauser, Adrian Grani, Paolo Hartl, Michael Henry, David Huber, Heinrich Keller, Christoph Kenworthy, Matthew Kravchenko, Kateryna Lightfoot, John Lunney, David Lutz, Dieter Macintosh, Mike Manucci, Filippo Ott, Thomas Pearson, David Puglisi, Alfio Rabien, Sebastian Rau, Christian Riccardi, Armando Salasnich, Bernardo Shimizu, Taro Snik, Frans Sturm, Eckhard Tacconi, Linda Taylor, William Valentini, Angelo Waring, Christopher Wiezorrek, Erich Xompero, Marco Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics The Enhanced Resolution Imager and Spectrograph (ERIS) is the new Adaptive-Optics (AO) assisted Infrared instrument at the Very Large Telescope (VLT). Its refurbished Integral Field Spectrograph (IFS) SPIFFIER leverages a new AO module, enabling high-contrast imaging applications and giving access to the orbital and atmospheric characterisation of super-Jovian exoplanets. We test the detection limits of ERIS and demonstrate its scientific potential by exploring the atmospheric composition of the young super-Jovian AF Lep b and improving its orbital solution by measuring its radial velocity relative to its host star. We present new spectroscopic observations of AF Lep b in $K$-band at $R\sim 11000$ obtained with ERIS/SPIFFIER at the VLT. We reduce the data using the standard pipeline together with a custom wavelength calibration routine, and remove the stellar PSF using principal component analysis along the spectral axis. We compute molecular maps by cross-correlating the residuals with molecular spectral templates and measure the radial velocity of the planet relative to the star. Furthermore, we compute contrast grids for molecular mapping by injecting fake planets. We detect a strong signal from H$_{2}$O and CO but not from CH$_{4}$ or CO$_{2}$. This result corroborates the hypothesis of chemical disequilibrium in the atmosphere of AF Lep b. Our measurement of the RV of the planet yields $Δv_{\mathrm{R,P\star}} = 7.8 \pm 1.7$ km s$^{-1}$. This enables us to disentangle the degeneracy of the orbital solution, namely the correct longitude of the ascending node is $Ω=248^{+0.4}_{-0.7}$ deg and the argument of periapsis is $ω=109^{+13}_{-21}$ deg. Our results demonstrate the competitiveness of the new ERIS/SPIFFIER instrument for the orbital and atmospheric characterisation of exoplanets at high contrast and small angular separation. |
| title | High-contrast spectroscopy with the new VLT/ERIS instrument: Molecular maps and radial velocity of the gas giant AF Lep b |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2502.19961 |