Detailed spectroscopic and photometric analysis of the remarkable planet-hosting wide binary system HD 202772A/B
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2025
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| author | Jofré, Emiliano Chew, Yilen Gómez Maqueo Petrucci, Romina Saffe, Carlos Galarza, Jhon Yana Miquelarena, Paula Ronco, María Paula Cerioni, Matías Zuloaga, Camila Martioli, Eder Faedi, Francesca Martínez, Cintia Saker, Leila Meléndez, Jorge Trivigno, Matías Flores Hebb, Leslie Díaz, Rodrigo García, Luciano |
| author_facet | Jofré, Emiliano Chew, Yilen Gómez Maqueo Petrucci, Romina Saffe, Carlos Galarza, Jhon Yana Miquelarena, Paula Ronco, María Paula Cerioni, Matías Zuloaga, Camila Martioli, Eder Faedi, Francesca Martínez, Cintia Saker, Leila Meléndez, Jorge Trivigno, Matías Flores Hebb, Leslie Díaz, Rodrigo García, Luciano |
| contents | We conducted a detailed spectroscopic and photometric characterization of the planet-hosting wide binary HD 202772A/B. No planet has been detected around HD 202772B, whereas HD 202772A, more evolved than its companion and near the end of its main-sequence (MS) phase, hosts a transiting hot Jupiter. The system has one of the hottest components ($T_{\mathrm{eff}; A} \sim 6440$ K) and one of the largest surface gravity differences between components ($Δ\log g_{A-B} \sim 0.4$ dex) among MS planet-hosting wide binaries. Using a global fit including our stellar parameters, radial velocities, and new TESS data, we derive refined properties of the planet orbiting HD 202772A, finding it to be the most irradiated hot Jupiter known in a wide binary. We also constrain the presence of additional transiting planets around HD 202772A and new transiting planets around HD 202772B using TESS photometry. We derive high-precision, strictly differential abundances for 27 species based on Gemini-GRACES spectra. HD 202772A shows lower lithium abundance (by 0.45 dex) relative to B, consistent with their stellar parameter differences. We also detect a small but significant enhancement in refractory elements in HD 202772A, particularly those with condensation temperatures above 1400 K (+0.018 $\pm$ 0.004 dex). We explored several scenarios to explain the observed chemical anomalies. Our analysis suggests that rocky planet engulfment, primordial inhomogeneities, and $δ$ Scuti-related effects are unlikely to fully account for the chemical pattern. Instead, the differences observed in certain refractory elements might support atomic diffusion as the most plausible explanation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_01595 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detailed spectroscopic and photometric analysis of the remarkable planet-hosting wide binary system HD 202772A/B Jofré, Emiliano Chew, Yilen Gómez Maqueo Petrucci, Romina Saffe, Carlos Galarza, Jhon Yana Miquelarena, Paula Ronco, María Paula Cerioni, Matías Zuloaga, Camila Martioli, Eder Faedi, Francesca Martínez, Cintia Saker, Leila Meléndez, Jorge Trivigno, Matías Flores Hebb, Leslie Díaz, Rodrigo García, Luciano Earth and Planetary Astrophysics Solar and Stellar Astrophysics We conducted a detailed spectroscopic and photometric characterization of the planet-hosting wide binary HD 202772A/B. No planet has been detected around HD 202772B, whereas HD 202772A, more evolved than its companion and near the end of its main-sequence (MS) phase, hosts a transiting hot Jupiter. The system has one of the hottest components ($T_{\mathrm{eff}; A} \sim 6440$ K) and one of the largest surface gravity differences between components ($Δ\log g_{A-B} \sim 0.4$ dex) among MS planet-hosting wide binaries. Using a global fit including our stellar parameters, radial velocities, and new TESS data, we derive refined properties of the planet orbiting HD 202772A, finding it to be the most irradiated hot Jupiter known in a wide binary. We also constrain the presence of additional transiting planets around HD 202772A and new transiting planets around HD 202772B using TESS photometry. We derive high-precision, strictly differential abundances for 27 species based on Gemini-GRACES spectra. HD 202772A shows lower lithium abundance (by 0.45 dex) relative to B, consistent with their stellar parameter differences. We also detect a small but significant enhancement in refractory elements in HD 202772A, particularly those with condensation temperatures above 1400 K (+0.018 $\pm$ 0.004 dex). We explored several scenarios to explain the observed chemical anomalies. Our analysis suggests that rocky planet engulfment, primordial inhomogeneities, and $δ$ Scuti-related effects are unlikely to fully account for the chemical pattern. Instead, the differences observed in certain refractory elements might support atomic diffusion as the most plausible explanation. |
| title | Detailed spectroscopic and photometric analysis of the remarkable planet-hosting wide binary system HD 202772A/B |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2511.01595 |