PHOTOMETRIC OBSERVATIONS AND REFINED SYSTEM PARAMETERS OF THE HIGH-DENSITY GAS GIANT HAT-P-20 b

Nazlı Karaman

Makale detayları

PHOTOMETRIC OBSERVATIONS AND REFINED SYSTEM PARAMETERS OF THE HIGH-DENSITY GAS GIANT HAT-P-20 b

Yazarlar:

Nazlı Karaman

Yayıncı:

Ataturk University

Ana Başlıklar:

Yıldız Astronomisi ve Gezegen Sistemleri

Dergi:

Journal of Anatolian Physics and Astronomy Vol.4 Issue 1, pp.32-37

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001352381

pISSN:

2791-8718

Anahtar kelimeler:

Özet:

 The discovery of thousands of exoplanets in recent decades has not only advanced our understanding of planetary formation processes but also guided efforts to identify potentially habitable environments beyond the Solar System. Among the most effective detection techniques is the transit photometry method, while advanced methods such as Transit Timing Variation TTV offer critical insights into the gravitational interactions within multi-planetary systems and may even indicate the presence of non-transiting planets. In this context, HAT-P-20 b is a remarkable gas giant discovered by the HATNet project, orbiting a K-type main-sequence star. With its exceptionally high density 13.8 gcm³, short orbital period 2.9 days, and close proximity to its host star 0.0361 AU, it stands out among known hot Jupiters. Possessing a mass of approximately 7.25 Jupiter masses and a radius of 0.867 Jupiter radii, this planet poses intriguing questions about planetary composition and structure. Additionally, the high stellar activity of the host complicates photometric modeling and accurate determination of orbital parameters. In this study, we present a photometric analysis of HAT-P-20 b based on transit observations obtained on January 15, 2017, using the ground-based ADYU60 telescope. The data were reduced using AstroImageJ AIJ and modeled with the EXOFAST software. The resulting light curve was used to update the systems physical parameters, which were compared with previous literature values. The updated parameters for HAT-P-20 b are consistent with previous studies within the margin of uncertainty. Furthermore, the transit minimum timing was determined to contribute to ongoing efforts in identifying potential third bodies in the system. The findings presented here refine the structural and dynamical understanding of the HAT-P-20 system and provide valuable data for future exoplanetary studies.

 The discovery of thousands of exoplanets in recent decades has not only advanced our understanding of planetary formation processes but also guided efforts to identify potentially habitable environments beyond the Solar System. Among the most effective detection techniques is the transit photometry method, while advanced methods such as Transit Timing Variation TTV offer critical insights into the gravitational interactions within multi-planetary systems and may even indicate the presence of non-transiting planets. In this context, HAT-P-20 b is a remarkable gas giant discovered by the HATNet project, orbiting a K-type main-sequence star. With its exceptionally high density 13.8 gcm³, short orbital period 2.9 days, and close proximity to its host star 0.0361 AU, it stands out among known hot Jupiters. Possessing a mass of approximately 7.25 Jupiter masses and a radius of 0.867 Jupiter radii, this planet poses intriguing questions about planetary composition and structure. Additionally, the high stellar activity of the host complicates photometric modeling and accurate determination of orbital parameters. In this study, we present a photometric analysis of HAT-P-20 b based on transit observations obtained on January 15, 2017, using the ground-based ADYU60 telescope. The data were reduced using AstroImageJ AIJ and modeled with the EXOFAST software. The resulting light curve was used to update the systems physical parameters, which were compared with previous literature values. The updated parameters for HAT-P-20 b are consistent with previous studies within the margin of uncertainty. Furthermore, the transit minimum timing was determined to contribute to ongoing efforts in identifying potential third bodies in the system. The findings presented here refine the structural and dynamical understanding of the HAT-P-20 system and provide valuable data for future exoplanetary studies.

 The discovery of thousands of exoplanets in recent decades has not only advanced our understanding of planetary formation processes but also guided efforts to identify potentially habitable environments beyond the Solar System. Among the most effective detection techniques is the transit photometry method, while advanced methods such as Transit Timing Variation TTV offer critical insights into the gravitational interactions within multi-planetary systems and may even indicate the presence of non-transiting planets. In this context, HAT-P-20 b is a remarkable gas giant discovered by the HATNet project, orbiting a K-type main-sequence star. With its exceptionally high density 13.8 gcm³, short orbital period 2.9 days, and close proximity to its host star 0.0361 AU, it stands out among known hot Jupiters. Possessing a mass of approximately 7.25 Jupiter masses and a radius of 0.867 Jupiter radii, this planet poses intriguing questions about planetary composition and structure. Additionally, the high stellar activity of the host complicates photometric modeling and accurate determination of orbital parameters. In this study, we present a photometric analysis of HAT-P-20 b based on transit observations obtained on January 15, 2017, using the ground-based ADYU60 telescope. The data were reduced using AstroImageJ AIJ and modeled with the EXOFAST software. The resulting light curve was used to update the systems physical parameters, which were compared with previous literature values. The updated parameters for HAT-P-20 b are consistent with previous studies within the margin of uncertainty. Furthermore, the transit minimum timing was determined to contribute to ongoing efforts in identifying potential third bodies in the system. The findings presented here refine the structural and dynamical understanding of the HAT-P-20 system and provide valuable data for future exoplanetary studies.

 Günümüzde, binlerce ötegezegenin keşfi yalnızca gezegen oluşumu süreçlerini anlamamıza katkı sağlamakla kalmamakta, aynı zamanda yaşamın var olabileceği potansiyel ortamları tanımlama çabalarımıza da yön vermektedir. Ötegezegenlerin keşfinde en yaygın kullanılan yöntemlerin başında transit geçiş fotometrisi gelmektedir. Geçiş zamanları değişimleri Transit Timing Variation, TTV gibi ileri analiz teknikleri ise, çoklu gezegen sistemlerindeki kütleçekimsel etkileşimleri modellemek ve gözlenemeyen gezegenleri ortaya çıkarmak açısından kritik öneme sahiptir. Bu bağlamda, HATNet projesi kapsamında keşfedilen ve K-tipinde bir ana kol yıldızı olan HAT-P-20nin etrafında dolanan HAT-P-20 b, yüksek yoğunluğu 13.8 gcm³, kısa yörünge periyodu 2.9 gün ve yıldızına olan yakın konumu 0.0361 AU ile dikkat çeken özgün bir gaz devi ötegezegendir. Yaklaşık 7.25 Jüpiter kütlesine ve 0.867 Jüpiter yarıçapına sahip olan bu gezegen, özellikle yüksek yoğunluğu ile literatürdeki benzer sıcak Jüpiterlerden ayrışmakta ve iç yapısına ilişkin önemli soruları gündeme getirmektedir. Ayrıca, sistemin yüksek yıldız aktivitesi nedeniyle ışık eğrilerinde ortaya çıkan düzensizlikler, hem fotometrik modelleme süreçlerini hem de yörüngesel parametrelerin hassas tayinini daha da karmaşık hale getirmektedir. Bu çalışmada, HAT-P-20 sistemine ait geçiş gözlemleri yer tabanlı ADYU60 teleskobu ile gerçekleştirilmiş, elde edilen veriler AstroImageJ ile işlenmiş ve EXOFAST yazılımı ile modelleme yapılmıştır. HAT-P-20 bnin geçişinden elde edilen ışık eğrisi analiz edilerek gezegenin fiziksel parametreleri güncellenmiş, önceki literatür verileriyle karşılaştırılmıştır. HAT-P-20 b için güncellenen bu sistem parametrelerinden bazıları M_P7.095162_-0.2439790.266785, R_P0.843269_-0.0250780.026292R_J, a0.035701_-0.0006130.000665 AU dur. Bu değerler incelendiğinde literatür değerleri ile belirsizlikler aralığında uyum içerisinde olduğu görülmektedir. Ayrıca, geçişin minimum zamanları belirlenerek sistemde olası üçüncü cisim varlığına dair yapılan çalışmalara bir katkı sunmak hedeflenmiştir. Bu geçiş için belirlenen minimum geçiş zamanı T_02457769.357408_-0.0014760.001403BJD dir. Yapılan bu çalışma HAT-P-20 sisteminin hem yapısal hem de dinamik özelliklerine ilişkin daha hassas değerler ortaya koymuş, bu yönüyle literatüre katkı sunmuştur.

Makale detayları

PHOTOMETRIC OBSERVATIONS AND REFINED SYSTEM PARAMETERS OF THE HIGH-DENSITY GAS GIANT HAT-P-20 b

Yazarlar:

Nazlı Karaman

Yayıncı:

Ataturk University

Ana Başlıklar:

Yıldız Astronomisi ve Gezegen Sistemleri

Dergi:

Journal of Anatolian Physics and Astronomy Vol.4 Issue 1, pp.32-37

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001352381

pISSN:

2791-8718

Planetary Systems

Exoplanets

HAT-P-20Gezegen Sistemleri

Ötegezegenler

HAT-P-20

Sayı

Makale detayları

PHOTOMETRIC OBSERVATIONS AND REFINED SYSTEM PARAMETERS OF THE HIGH-DENSITY GAS GIANT HAT-P-20 b

Yazarlar: Nazlı Karaman

Yayıncı: Ataturk University

Ana Başlıklar: Yıldız Astronomisi ve Gezegen Sistemleri

Dergi: Journal of Anatolian Physics and Astronomy Vol.4 Issue 1, pp.32-37

Belge Tipi: Makale

Yayın Tarihi: 6/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001352381

pISSN: 2791-8718

Planetary Systems

Exoplanets

HAT-P-20Gezegen Sistemleri

Ötegezegenler

HAT-P-20

Sayı

Yazarlar:

Nazlı Karaman

Yayıncı:

Ataturk University

Ana Başlıklar:

Yıldız Astronomisi ve Gezegen Sistemleri

Dergi:

Journal of Anatolian Physics and Astronomy Vol.4 Issue 1, pp.32-37

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001352381

pISSN:

2791-8718