Free Astronomy Magazine September-October 2023 ARABIC VERSION

A chemical may help detect and confirm protoplanets by ALMAObservatory Nicolás Lira cientists using the Atacama Large Millimeter/submillimeter Array (ALMA) to study the pro- toplanetary disk around a young star have discovered the most com- pelling chemical evidence to date of the formation of protoplanets. The discovery will provide astronomers with an alternate method for de- tecting and characterizing proto- planets when direct observations or imaging are not possible. HD 169142 is a young star located in the con- stellation Sagittarius that is of signif- icant interest to astronomers due to ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 16 اﻟ ﺼﻤﺎت اﻟﻜ ﻤ ﺎﺋ ﺔ ﻗﺪ ﺗﺴﺎﻋﺪ ﻓﻲاﻛﺘﺸﺎف اﻟ ﻮاﻛﺐ اﻷوﻟ ﺔ وﺗﺄﻛ ﺪﻫﺎ اﻛﺘ ﻒ ــــ اﻟﻌﻠﻤﺎء ﺑﺎﺳﺘﺨﺪام ﺔ ﻣﺼـﻔﻮﻓ ﻣﺮﺻﺪ أﺗﺎﻛﺎﻣﺎ ا ﻠﻴﻤﱰي / ﺗﺤـﺖ ا ﻠﻴﻤـﱰي اﻟﻜﺒ ( أ ﺎ) ﻟﺪراﺳﺔ ﻗﺮص اﻟﻜﻮاﻛﺐ اﻷوﻟﻴـﺔ ﺣﻮل ﻧﺠﻢ ﺷﺎب اﻟـﺪﻟﻴﻞ اﻟﻜﻴﻤﻴـﺎﺋﻲ اﻷﻛﺜـﺮ إﻗﻨﺎﻋًﺎ ــــــ إﻗﻨﺎﻋـﺎً ﺣﺘـﻰ اﻵن ﻋـﲆ ﺗﻜـﻮﻳﻦ اﻟﻜﻮاﻛـﺐ اﻷوﻟﻴﺔ و ﺳﻴﻮﻓﺮ ﻫﺬا اﻻﻛﺘﺸﺎف ﻟﻌﻠﻤﺎء اﻟﻔﻠﻚ ﻃﺮﻳﻘﺔ ﺑﺪﻳﻠﺔ ﻻﻛﺘﺸﺎف وﺗﻮﺻﻴﻒ اﻟﻜﻮاﻛﺐ اﻷوﻟﻴﺔ ﻋﻨﺪﻣﺎ ﻻ ﺗﻜﻮن اﻷرﺻﺎد ا ﺒـﺎﴍة أو اﻟﺘﺼﻮﻳﺮ .. ﻣﻤﻜﻨﺔ اﻟﺘﺼﻮﻳﺮ . ﻣﻤﻜـﻦ HD 169142 ﻫـﻮ ﻧﺠـﻢ ﻳـﺎﻓﻊ ﻳﻮﺟـﺪ ﰲ ﻛﻮﻛﺒــﺔ اﻟﻘـﻮس وﻳﺤﻈـﻰ ﺑﺎﻫﺘﻤﺎم ﻛﺒ ﻣﻦ ﻗﺒﻞ اﻟ ﻌﻠﻤﺎء ﺑﺴﺒﺐ وﺟﻮد ﻗﺮص ﺣﻮﻟـﻪ ﺿﺨﻢ ﻏﻨـﻲ ﺑﺎﻟﻐﺒـﺎر واﻟﻐـﺎز واﻟﺬي ﻳﻤﻜﻦ رؤﻳﺘﻪ ﺗﻘﺮﻳﺒًﺎ وﺟﻬًﺎ . ﻟﻮﺟﻪ إﻛﺘﺸﻒ - ﺳﺒﺘﻤﺒﺮ ﺃﻛﺘﻮﺑﺮ 2 0 2 3